Python driver ansys code example to execute apdl file

introduction

Drive ANSYS to execute APDL (ANSYS Parametric Design Language) file in Python. You can use the subprocess module to call the executable file of ANSYS and pass the APDL file as a parameter. This approach can automate many ANSYS simulation tasks, saving time and reducing human errors.

Below is a detailed code example showing how to drive ANSYS to execute APDL files in Python. Suppose you have ANSYS installed and you know the path to the ANSYS executable file and the path to the APDL file.

1. Prerequisites

1. ANSYS installation: Make sure ANSYS is installed correctly on your system and you can run ANSYS via the command line.
2. APDL file: There is an APDL file (e.g.), which contains the ANSYS command you want to execute.
3. Python environment: Make sure you have a Python environment and have it installedsubprocessModules (with Python standard library, no additional installation is required).

2. Code examples

import subprocess
import os
 
def run_ansys_apdl(apdl_file_path, ansys_executable_path=None):
    """
    runANSYSand execute the specifiedAPDLdocument。
 
    parameter:
    apdl_file_path (str): APDLdocument的路径。
    ansys_executable_path (str, Optional): ANSYS可执行document的路径。If not provided，Try to find from environment variables。
 
    return:
    None
    """
    # If the ANSYS executable path is not provided, try to find it from the environment variable    if ansys_executable_path is None:
        # Assume that the environment variable contains the path of ANSYS, such as "ANSYS2023R1"        for env_var in :
            if "ANSYS" in env_var:
                ansys_install_dir = [env_var]
                # Assume that the ANSYS executable is located in the "bin\winx64" folder in the installation directory                ansys_executable_path = (ansys_install_dir, "bin", "winx64", "")
                break
        
        # If not found, throw an exception        if ansys_executable_path is None:
            raise ValueError("The ANSYS executable file path is not found, please provide the ansys_executable_path parameter.")
    
    # Build the ANSYS command to run the APDL file    # Note: The specific command line parameters may vary depending on the ANSYS version. Here we take ANSYS2023R1 as an example    command = [
        ansys_executable_path,
        "-b",  # Batch mode        "-i", apdl_file_path,  # Enter the APDL file        "-o", apdl_file_path.replace(".apd", ".out")  # Output file    ]
    
    try:
        # Use subprocess to run the ANSYS command        result = (command, check=True, stdout=, stderr=)
        print("ANSYS runs successfully.")
        print("Standard Output:")
        print(('utf-8'))
    except  as e:
        print("ANSYS run failed.")
        print("Error output:")
        print(('utf-8'))
 
# Example usageif __name__ == "__main__":
    apdl_file = "path/to/your/"  # Replace with your APDL file path    # ansys_executable = "path/to/your/" # Optional: Provide the path to the ANSYS executable file    
    run_ansys_apdl(apdl_file)

3. Code description

1. Import module: ImportsubprocessandosModule.
2. Define functions：run_ansys_apdlThe function accepts two parameters:apdl_file_path(path of APDL file) andansys_executable_path(Path to the ANSYS executable, optional).
3. Find ANSYS executable: If the path to the ANSYS executable is not provided, try to look it out of the environment variable. This assumes that the environment variable contains the ANSYS installation path.
4. Build commands: Build the ANSYS command to run the APDL file. Here, assume that ANSYS version is 2023R1 and uses batch mode (-b), input file (-i) and output files (-o)parameter.
5. Run the command:useThe function runs the ANSYS command and captures both standard output and error output.
6. Error handling: If ANSYS run fails, an error output is printed.
7. Example usage:exist__main__Example usage provided in the block, callrun_ansys_apdlfunction and pass the APDL file path.

4. Things to note

1. ANSYS version: Different versions of ANSYS may have different command line parameters and executable file paths. Please adjust the code according to your ANSYS version.
2. Environment variables: Make sure that your environment variable contains the ANSYS installation path, or provide the full path to the ANSYS executable file.
3. APDL file path: Make sure the APDL file path provided is correct and that the file exists.

With the above method, you can easily automate ANSYS simulation tasks in Python, improving efficiency and accuracy.

5. Steps to execute the apdl file by python driver ansys

Drive ANSYS to execute APDL (ANSYS Parametric Design Language) files in Python usually involves the following steps:

1. Prepare APDL files:
   • Write or prepare the APDL script file you want ANSYS to execute (usually with.apdor.txtis the extension). This file should contain a complete set of ANSYS commands to define the model, set the analysis type, apply loads and boundary conditions, etc.
2. Determine the ANSYS executable path:
   • Find the executable file in the ANSYS installation directory (e.g.ANSYS<version number>.exe). This path may vary depending on the installation method and ANSYS version. Usually, it is located in the installation directorybin\winx64(For Windows systems) or similar directories.
3. Write Python scripts:
   • Using PythonsubprocessThe module writes a script to call the ANSYS executable file and passes the APDL file as input.
4. Set command line parameters:
   • According to the command line interface of ANSYS, set the necessary parameters to specify the batch mode (-b), input file (-i) and output files (-o）。
5. Run Python scripts:
   • Execute a Python script, which will start ANSYS and run the specified APDL file.
6. Process the output:
   • Capture the output of ANSYS (standard output and error output) for further processing or recording in Python scripts.
7. (Optional) Next steps for automation:
   • As needed, you can add logic to the Python script to process the output files generated by ANSYS (such as result files, log files, etc.), or automate other subsequent steps (such as post-processing, result analysis, etc.).

Here is a simplified Python script example showing how to perform these steps:

import subprocess
 
# Set the ANSYS executable file path and APDL file pathansys_executable_path = r"C:\Program Files\ANSYS Inc\v<version number>\ANSYS\bin\winx64\ANSYS<version number>.exe"
apdl_file_path = r"C:\path\to\your\apdl_script.apd"
output_file_path = apdl_file_path.replace(".apd", ".out")
 
# Build ANSYS command line parameterscommand = [
    ansys_executable_path,
    "-b",  # Batch mode    "-i", apdl_file_path,  # Enter the APDL file    "-o", output_file_path  # Output file]
 
# Run the ANSYS command and capture the outputtry:
    result = (command, check=True, stdout=, stderr=, text=True)
    print("ANSYS runs successfully.")
    print("Standard Output:")
    print()
except  as e:
    print("ANSYS run failed.")
    print("Error output:")
    print()

Notice：

• Pleaseansys_executable_pathandapdl_file_pathReplace with your own ANSYS executable file path and APDL file path.
• text=TrueThe arguments were introduced in Python 3.7 and later, which allows the output to be captured as a string instead of a byte object. If your Python version is lower, you may need to manually decode the output (for example, using('utf-8')）。
• Ensure backslashes in ANSYS executable path and APDL file path (\) is the original string (usingr""prefix) or correctly escaped in a string (using\\）。
• Depending on your ANSYS version and configuration, you may need to adjust the command line parameters. For example, some versions of ANSYS may use different command line interfaces or parameters.

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