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[blockMesh] Parametrizing BlockMesh (preferably without m4) |
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October 1, 2021, 05:19 |
Parametrizing BlockMesh (preferably without m4)
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#1 |
New Member
Join Date: Dec 2016
Posts: 24
Rep Power: 9 |
Hi everyone,
I have a tricky, maybe even impossible question. The goal is to mesh a quarter (axisymmetric) cylinder with fixed length and radius L and R. The cylinder wall is divided into N patches of equal length L/N (see the attached figure for N=5). Right now I create vertices and blocks manually. You can imagine that if N becomes large, I can spend the entire day making a single mesh. Therefore, I'd like to parametrize N and let the script do it for me. The problem is that loops are not a thing in the BlockMeshDict (at least not to my knowing). I know about m4 but the documentation is marginal. What is the best approach here? Thanks in advance! |
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October 1, 2021, 05:28 |
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#2 |
Senior Member
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October 1, 2021, 08:55 |
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#3 |
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Gerhard Holzinger
Join Date: Feb 2012
Location: Austria
Posts: 342
Rep Power: 28 |
If you only want to use variable parameters, and don't need the entire magic that Python-scripting has to offer, you can also use OpenFOAM's on-board tools, i.e., using variables in dictionaries, the code-stream magic.
A parametric blockMeshDict from the tutorials |
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October 4, 2021, 06:53 |
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#4 | ||
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Join Date: Dec 2016
Posts: 24
Rep Power: 9 |
Quote:
I installed and prioritized python 3.8 so not really sure where the error is originating from. Quote:
Code:
radius 0.0005; Len 0.001; nSegments 5.0; radHalfAngle #calc "degToRad($halfAngle)"; y #calc "$radius*sin($radHalfAngle)"; minY #calc "-1.0*$y"; z #calc "$radius*cos($radHalfAngle)"; segmentLength #calc "$Len / $nSegments"; codeStream #{ std::array<float, $nSegments> lenarray; for (int i=1;i<$nSegments;i++) { lenarray[i] = $segmentLength*i; } #}; |
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