MESH REPLACEMENT |
Chapter 13 |
Creating Ahead Files for the Dense Mesh |
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Figure 13-6 Exhaust flow boundary
All necessary settings have now been defined for the dense model. The only remaining action is to write the data files via the Star Controls panel.
•In the Write data view of the Star Controls panel, click Write data
Creating Ahead Files for the Dense Mesh
As the dense mesh contains considerably more cells than the coarse mesh, it is advantageous to use Ahead Files (see Chapter 11 of the User Guide). This practice avoids the possibility of STAR waiting for es-ice to complete its part in the simulation at every time step. The mvmesh.sh panel is used to define several scripts, which in turn create the Ahead Files. During the analysis, Ice reads these grids instead of generating meshes, thus reducing the calculation time. Note that the same process can be carried out on the coarse mesh if desired, although the low cell count makes it unnecessary.
To create the ahead scripts:
•In the Select panel, click mvmesh.sh to open the mvmesh.sh panel
•Select the Events ahead script toggle button to activate the Ahead Files section of the panel
•Accept the remaining default settings. You can change these settings for other cases, depending on the nature of the mesh and system resources
•Click Write to create the scripts in the
ahead subdirectory located within the current working directory.
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Chapter 13 |
MESH REPLACEMENT |
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Creating Ahead Files for the Dense Mesh |
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Since Ahead Files are used, you need to update the settings within the mvmesh.sh file (see Chapter 11 in the User Guide). To set up this file:
• Locate the Move mesh script section of the mvmesh.sh panel, shown in the adjacent screenshot
•Set Processes to 1
•Accept the remaining defaults. Again, you can change these settings in your own cases to optimise the analysis run time.
•Click Write
•Click Yes in the es-ice command window to overwrite the existing mvmesh.sh
file. The file is updated to reflect the changed settings.
Finally you must execute the head scripts in order to generate the event meshes. This procedure is different between Linux and Windows.
On Linux:
•Enter the following commands in a shell prompt: sh ahead/<filename>.sh
where <filename> is one of the ahead scripts in the ahead directory
•Alternatively, you can use a script to execute each ahead script in turn. For example:
for filename in ahead/*.sh do
sh $filename done
exit 0
On Windows:
•Enter the following commands in a PowerShell prompt:
Ice.exe -sB=<filename>.sh
where <filename> is one of the ahead scripts in the ahead directory
•Alternatively, you can use a batch file to execute each ahead script in turn. For example:
for %%f in(.\*sh) do Ice.exe -sB=%%f
exit 0
The set-up for the dense model is now complete.
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MESH REPLACEMENT |
Chapter 13 |
Defining Mesh Replacements |
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•In the Select panel, click Write Data
•In the Write Tool, enter save_es-ice.dense_final and click Save
•Close es-ice
Defining Mesh Replacements
Mesh replacements must be defined within the master model file. In this tutorial, the coarse model is the master model, which means changing the working directory and loading save_es-ice.4-final into es-ice.
•Make the directory containing the coarse model file (save_es-ice.4-final) your current working directory and then launch es-ice in the usual manner
•In the Select panel, click Read Data
•In the Read Tool, click the ellipsis (...) button next to the Resume file box and select the coarse model file (save_es-ice.4-final) from the browser. This action loads the coarse model and displays it in the
Template window.
Mesh replacements can now be defined using the Multiple mesh panel (see Chapter 6, “Meshes for Simulation with Mesh Replacement” in the User Guide). The first mesh-replacement operation is described below in some detail while the rest of the required settings are summarised in a table.
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