JP3099752B2 - Simulation system, steering method in simulation system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] 1. Field of the Invention [0002] The present invention relates to a simulation system capable of performing a steering operation for changing setting parameters during execution of a simulation program, a steering method in the simulation system, and a storage medium storing a steering program.

[0001]

2. Description of the Related Art In a simulation related to a technical calculation such as a fluid analysis, a setting parameter is intentionally changed during execution of a simulation program, and a similar simulation may be performed in a state after the change. Dynamically changing the simulation execution mode without interrupting the simulation in this manner is called a steering operation.

[0002] For example, a steering operation is performed in a case where some trouble is found in a result output from a simulation, analysis is temporarily stopped, setting parameters are changed, and the simulation is restarted. In such a case, if the steering operation is performed, it is not always necessary to restart the simulation from the beginning.

The conventional steering operation has been realized by incorporating an input / output processing unit for performing input / output processing for steering operation in a simulation program in advance.

Here, a conventional technique will be described with reference to FIG.

In FIG. 4, a simulation program G1 has an initialization section G2 for securing a data area in the program (program initialization) and reading data, an iterative processing section (G3 to G7), and opening a data area. Termination processing unit G8 that performs such as (program termination)
Consists of

[0006] The iterative processing part includes an arithmetic processing part G6 for solving various quantities related to the simulation, and a result output part G7.
And The iterative processing portion further includes input / output processing units G3, G4, and G5 for steering operation for changing setting parameters related to the simulation or changing the execution mode (pause, re-execution, interruption, and the like).

The input / output processing units G3, G4, G5 are executed, for example, every time a repetitive process is performed with the progress of simulation time, regardless of the presence or absence of a steering operation request. Specifically, the inquiry message output unit G3 outputs a steering operation inquiry message to the output device H1, and the steering operation input unit G4 checks whether or not there is an input for steering operation from the input device H2. Here, if there is an input, the input data check unit G5 checks the validity / consistency of the input content and performs necessary error processing, and passes the condition changed by the steering operation to the arithmetic processing unit G6. . On the other hand, if no input is made, the system waits for an input of a steering operation for a certain time,
Thereafter, the processing is passed to the arithmetic processing unit G6.

[0008]

However, in this conventional steering operation, the execution of the simulation program is interrupted by input / output for the steering operation, so that the execution speed of the simulation program is reduced. was there.

An object of the present invention is to provide a simulation system which can be executed at high speed.

It is another object of the present invention to provide a simulation system whose execution is not interrupted by input / output for steering operation.

Still another object of the present invention is to provide a steering method and a storage medium storing a steering program that do not reduce the execution speed of a simulation program.

[0012]

Means for Solving the Problems A first simulation system according to the present invention includes an arithmetic processing based on parameters and
Iterative processing consisting of output processing of the result of the arithmetic processing
And simulation means for executing a simulation program for performing, during execution of the simulation program by said simulation means, stain consisting output interface means for inputting steering operations instructions to change the parameters of the simulation program
The input / output interface
The steering operation command input from the
Said shared memory means, and said simulation means
Is the same as the above simulation program
Whether the shared memory means has been updated
The shared memory procedure only if it has been updated.
Read the steering operation command from the gear and
Parameters of the simulation program based on
After changing the
If not, repeat the above with the current parameters.
And continue the process .

[0013] A second simulation system according to the present invention is the first simulation system, wherein :
The input / output interface unit includes a steering operation input unit that inputs the steering operation command, an input data check unit that checks the validity of the steering operation command input by the steering operation input unit, and the input data check unit. And a shared memory writing unit for writing the steering operation command determined to be valid by the shared memory means to the shared memory means.

According to a third simulation system of the present invention, in the above-mentioned second simulation system, the simulation means further secures the shared memory means and sends address information of the shared memory means to the input / output interface means. A first initialization unit for transferring, the input / output interface unit further receives the address information from the first initialization unit, notifies the address information to the shared memory writing unit, and A second initial setting unit for outputting a message inquiring about the operation is provided.

[0015] The steering method in the first simulation system according to the present invention is a method based on parameters.
Repetition consisting of arithmetic processing and output processing of the result of the arithmetic processing
From a simulation means for executing a simulation program to perform processing, during the execution of the simulation program by said simulation means, and output interface means for inputting steering operations instructions to change the parameters of the simulation program
In the simulation system,
Steer for the interface means to change the parameter
Storing the ring operation instruction in the shared memory means
And the simulation means comprises:
The shared memory means for each repetition of the program
Judge whether or not is updated.
Only if the steering from the shared memory means
The operation instruction is read, and the simulation is performed based on the instruction.
After changing the parameters of the
Continues the return process, and if not updated, returns the current
Step to continue the above-mentioned repetition processing with the parameters
And a flop.

[0016] Steering method in the second simulation system of the present invention is a steering method in the first simulation system, before
The input / output interface means controls the steering operation command.
And a steering operation inputting step of inputting a command.
An output interface means is provided for the steering operation input switch.
Validity of the steering operation command input in step
An input data check step for checking
Output interface means for input data check
The steering operation command determined to be
Shared memory write step for writing to shared memory means
And included.

[0017] Steering method in the third simulation system of the present invention is a steering method in the second simulation system, before
Simulation means secures the shared memory means
And the address information of the shared memory means is input / output
A first initialization step for passing to the interface means;
The input / output interface means is configured to execute the simulation
Receiving the address information from the
To the shared memory writing step.
Output a message asking about steering operation
A second initial setting step.

[0018]

[0019]

[0020]

[0021]

[0022]

[0023]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, an embodiment of the present invention includes a simulation program A1 for technical calculation, an input / output interface program B1 for steering operation, a shared memory C1 as a storage device, a keyboard and a mouse, and the like. And an output device C2 such as a display or a printing device. Note that an input / output interface program B1 having an input / output processing unit for performing a steering operation and a simulation program A
One exists as a separate program on the UNIX system, and generally they operate multitasking.

The shared memory C1 is a storage device in which instructions can be written / read by a plurality of programs.

The simulation program A1 includes a program initial setting section A2 and an iterative processing section (A3 to A3).
5) and a termination processing unit A6 for terminating the program.

The program initial setting section A2 initializes data used in the program, sets various initial conditions necessary for simulation calculation, and secures a shared memory C1 used in the program. Memory identifier F1 including address, size, etc. of memory C1
To the input / output interface program B1.

The repetitive processing portion of the program has a shared memory readout section A3, an arithmetic processing section A4 for solving various quantities related to the simulation, and a result output section A5 for outputting the result obtained by the arithmetic processing to an output device. . When the shared memory C1 is not updated, the shared memory reading unit A3 does not perform any processing,
If 1 has been updated, a steering operation instruction is read from the shared memory C1, and a change in a setting parameter related to the simulation or a change in the execution mode (pause, re-execution, interruption, data file output, etc.) is performed. Perform processing. Processing A in the iterative processing part
3, A4 and A5 are repeated until the state of the simulation satisfies the termination condition.

On the other hand, an input / output interface program B1 for steering operation includes an initial setting section B2, a steering operation input section B3, and an input data check section B.
4 and a shared memory writing unit B5.

The initial setting unit B2 receives the memory identifier F1 of the shared memory C1 from the simulation program A1, and outputs a steering operation inquiry message to the output device C2.

The steering operation input section B3 inputs data from the input device C3.

The input data check unit B4 determines whether the data read in the steering operation input unit B3 is a valid steering operation command, and if the data is valid, the processing is continued. Return to steering operation input section B3.

The shared memory writing unit B5 receives a steering operation command from the input data check unit B4, and writes the steering operation command in the shared memory C1 that is reserved in advance.

Next, the operation of the embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a flowchart showing the operation of the present embodiment.

Normally, only the simulation program A1 is started, and the input / output interface program B1 is also started only when a request for steering operation occurs. At the end of the steering operation, the input / output interface program B1 ends.

In the simulation program A1, the initial setting section A2 first performs program initialization (step D1). Then, the initial setting unit A2 secures the shared memory C1 used in the program. here,
When the shared memory C1 is normally secured, the UNIX system issues a memory identifier F1 including the address, size, and the like of the shared memory C1.
Is output to the input / output interface program B1 to notify the address, size, and the like of the shared memory C1 (step D2).

The shared memory read unit A3 determines whether or not the shared memory C1 has been updated (step D3). Only when the shared memory C1 has been updated, the shared memory C1 is updated.
To change various parameters of the simulation program A1 (step D4). Then, the arithmetic processing section A4 performs an arithmetic processing for solving various quantities related to the simulation based on the changed parameters (step D5), and outputs the result of the arithmetic processing to the result output section A
5 is output (step D6).

If the shared memory C1 has not been updated, the arithmetic processing section A4 performs arithmetic processing based on the current parameters (step D5), and the result of this arithmetic processing is output from the result output section A5 (step D6). .

Further, the termination processing unit A6 determines whether or not the termination condition of the program is satisfied (step D7), and if the termination condition is satisfied, releases the shared memory C1. , And the process ends (step D8).

On the other hand, the input / output interface program B
1 is activated by a request for a steering operation, and at the same time, the initial setting unit B2 acquires the memory identifier F1 of the shared memory C1 (step E1). Further, the initial setting unit B2 outputs a message inquiring about the input of the steering operation to the output device C2 (step E2).

Next, the steering operation input section B3 inputs a steering operation command (step E3), and after an error check, inputs this command to the initial setting section B2.
Shared memory C1 corresponding to the received memory identifier F1
(Step E4). When the steering operation is continuously performed, the input of the operation command and the writing to the shared memory C1 are further performed.

Further, the input / output interface program B1 determines the end of the steering operation (step E5), and when the steering operation ends, the input / output interface program B1 ends.

With the above, the operation of the embodiment of the present invention is completed.

In the present embodiment, an input / output interface program for performing input / output for steering operation is provided, and input / output data is transferred to a simulation program via a shared memory. This has the effect that the execution of the simulation program can be prevented from being interrupted by input and output.

Further, by preventing the execution of the simulation program from being interrupted by the input / output for steering operation, the simulation program can be executed at a high speed.

[0047]

Next, the operation of an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 3 shows the execution of a general steering operation using fluid analysis as an example.

The fluid analysis is a simulation for solving the Navier-Stokes equations governing the flow of a fluid and calculating physical quantities such as pressure and velocity of the fluid. In the fluid analysis, the setting parameters for solving the equations include, for example, physical quantities of the fluid and boundary conditions of the analysis region.

Since the Navier-Stokes equation is a partial differential equation in time and space, a finite difference method is applied using an iterative solution which is one of the solutions of the partial differential equation. In the finite difference method, the time derivative and the spatial derivative of the Navier-Stokes equation are converted into a difference form, respectively, and expressed as a difference expression divided by a minute time and a minute space. In one operation in the iterative calculation of the difference equation, a physical quantity of the space at a certain time is obtained. When the physical quantity is obtained, the time is advanced by a certain time, and the physical quantity of the fluid at the time of the next iterative calculation is obtained. By repeating this process, a physical quantity for each time is obtained. Here, various parameters in the fluid analysis can be generally changed during the progress of the iterative calculation.

As shown in FIG. 3, for example, the state of air flow when a rectangular obstacle K2 exists in a two-dimensional parallel plate is analyzed. Here, at the beginning of the analysis, both the entrance and the exit of the analysis area K1 are released, the inflow velocity of the air from the entrance is constant at v1, and other various conditions are arbitrary. Simulation program A1
Reads these initial conditions (step D1). Then, the simulation program A1 secures the shared memory C1, transmits the memory identifier to the input / output interface program B1 (step D2), and then starts the repetitive processing. In the repetitive processing, the update of the shared memory C1 is not performed unless the steering operation is designated, so that the processing of referring to the shared memory C1 is skipped (step D3).

On the other hand, when a request for steering operation is made at a certain point in time, the input / output interface program B1 is activated, and at the same time, the input / output interface program B1 is activated.
1 receives the memory identifier F1 of the shared memory C1 (step E1). Then, the input / output interface program B1 outputs a steering operation inquiry message (step E2). If the steering operation is performed in response to this and the air inflow speed is changed from v1 to v2 (step E3), the input / output interface program B1 shares a command to change the air inflow speed from v1 to v2. Write to memory C1 (step E
4).

The simulation program A1 determines whether or not the shared memory C1 has been updated (step D3). If the shared memory C1 has been updated, the contents of the shared memory C1 are read out and analyzed in a repetitive process. Is changed (step D4), and an arithmetic process (step D5) and a result output (step D6) are performed based on the changed condition. If the shared memory C1 has not been updated, the arithmetic processing (step D5) and the result output (step D6) based on the current condition are performed. The time of the analysis that proceeds with the repetitive processing can be confirmed by the output result at this time.

The input / output interface program B
1 judges whether or not the steering operation has been completed (step E5). If the steering operation has been normally completed, the input / output interface program B1 ends.

Then, the simulation program A1
Determines whether or not the analysis has reached a predetermined time after continuing the analysis (step D7). If the analysis has reached the predetermined time, the shared memory C1 is released and the analysis ends (step D7). Step D8).

With the above, the operation of the example of the embodiment of the present invention is completed.

[0057]

As described above, the present invention has an effect that execution of a simulation program can be prevented from being interrupted by input / output for steering operation.

The present invention has another effect that a simulation program can be executed at a high speed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the embodiment of the present invention.

FIG. 3 is a state diagram for explaining one embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a conventional technique.

[Explanation of symbols]

 A1, G1 Simulation program A2, G2 Initial setting unit A3 Shared memory readout unit A4, G6 Arithmetic processing unit A5, G7 Result output unit A6, G8 Termination processing unit B1 Input / output interface program B2 Initial setting unit B3, G4 Steering operation input Unit B4, G5 input data check unit B5 shared memory writing unit C1 shared memory C2, H1 output device C3, H2 input device F1 memory identifier G3 inquiry message output unit

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G06F 17/00 JICST file (JOIS)

Claims (6)

(57) [Claims] An arithmetic processing based on a parameter and the arithmetic processing
Means for executing a simulation program for performing repetitive processing including output processing of a simulation result, and a steering operation instruction for changing parameters of the simulation program during execution of the simulation program by the simulation means. Simulation consisting of input / output interface means for inputting
In Yonshisutemu, input from the output interface unit stearyl
Shared memory means for storing a simulation operation instruction, wherein the simulation means comprises:
The shared memory means is updated every time the program is repeated.
Judge whether it is new and if it is updated
Only the steering operation from the shared memory means
Read the instruction, and execute the simulation based on the instruction.
After changing the program parameters, repeat
Continues processing, and if not updated,
A simulation system wherein the repetition processing is continued with a meter . (2) A steering operation input unit that inputs the steering operation command; an input data check unit that checks the validity of the steering operation command input by the steering operation input unit; and the input data check unit 2. The simulation system according to claim 1, further comprising: a shared memory writing unit that writes the steering operation command determined to be valid by the shared memory unit into the shared memory unit. 3. 3. The simulation unit further includes a first initialization unit that secures the shared memory unit and transfers address information of the shared memory unit to the input / output interface unit. Further receives the address information from the first initial setting unit,
The simulation system according to claim 2, further comprising a second initial setting unit that notifies the address information to the shared memory writing unit and outputs a message inquiring about a steering operation. 4. An arithmetic processing based on a parameter and the arithmetic processing
Means for executing a simulation program for performing repetitive processing including output processing of a simulation result, and a steering operation instruction for changing parameters of the simulation program during execution of the simulation program by the simulation means. Simulation consisting of input / output interface means for inputting
The input / output interface changes parameters in the
Steering operation command for storage in the shared memory means
And the simulation means comprises:
The shared memory means is updated every time the program is repeated.
Judge whether it is new and if it is updated
Only the steering operation from the shared memory means
Read the instruction, and execute the simulation based on the instruction.
After changing the program parameters, repeat
Continues processing, and if not updated,
Continuing the iterative process with the meter still in use. 5. A steering operation input step of the input and output interface means for inputting the steering operation instruction input said output interface means for checking the validity of the steering operation command inputted by the steering operation input step 5. The data processing method according to claim 4, further comprising: a data check step; and a shared memory writing step in which the input / output interface unit writes the steering operation command determined to be valid in the input data check step to the shared memory unit. Simulation system. 6. The simulation means according to claim 1, wherein
Securing memory means and address information of the shared memory means
First pass to pass the data to the input / output interface means
A setting step, wherein the input / output interface means receives the address information from the simulation means, passes the address information to the shared memory writing step, and outputs a message inquiring about a steering operation. Is characterized by including
A steering method in the simulation system according to claim 5 .