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SHM works on drivaer body, so why not on my semi truck? |
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July 31, 2023, 11:44 |
SHM works on drivaer body, so why not on my semi truck?
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Senior Member
Alan w
Join Date: Feb 2021
Posts: 277
Rep Power: 6 |
My current project is to do CFD on a semi-truck, with an eye towards drag reduction. The first step is to get a simulation working with just the tractor part, adding the trailer later.
So I created a model of the tractor in Solidworks, and meshed it with Salome. Attached is an image showing the mesh of the stl file. Now the problem: when I run snappyHexMesh on it, it fails with this message: "mpirun noticed that process rank 7 with PID 12576 on node localhost exited on signal 9 (Killed)." My understanding of this message is that it indicates there is not enough system memory to do the job. However, I increased it from 8 to 20Gb, and it still fails. Here is the confusing part. I have downloaded the drivaer standard check simulation, and when I run the run_all_shm.sh script, it runs okay. And this was with 8Gb of memory. And the drivear body2 stl file has a size of 67Mb, whereas my tractor stl file has a size of 21Mb. So I ran surfaceCheck on both stl files. Here is the result for drivaer: Code:
Surface is not closed since not all edges connected to two faces: connected to one face : 0 connected to >2 faces : 1158 Conflicting face labels:7766 Dumping conflicting face labels to "problemFaces" Paste this into the input for surfaceSubset Number of unconnected parts : 3 Splitting surface into parts ... Writing zoning to "zone_body2.vtk"... writing part 0 size 60 to "body2_0.obj" writing part 1 size 2 to "body2_1.obj" writing part 2 size 367919 to "body2_2.obj" Number of zones (connected area with consistent normal) : 1145 More than one normal orientation. Code:
Surface is not closed since not all edges connected to two faces: connected to one face : 984 connected to >2 faces : 0 Conflicting face labels:984 Dumping conflicting face labels to "problemFaces" Paste this into the input for surfaceSubset Number of unconnected parts : 3 Splitting surface into parts ... Writing zoning to "zone_tractor.vtk"... writing part 0 size 117520 to "tractor_0.obj" writing part 1 size 56 to "tractor_1.obj" writing part 2 size 56 to "tractor_2.obj" Number of zones (connected area with consistent normal) : 3 More than one normal orientation. I hope that someone can help me clear this up, so I can get my case running. Thanks in advance! |
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