[snappyHexMesh] finding problems with emesh file

ptw1995 · March 25, 2021, 20:16

Hello everyone,I'm trying to export stl files from 3d modeling sofwares.
I've found that when CAD and solidworks export stl files,they'll turn all the coordinates into a positive value,which makes my blockmesh cannot intersect with my trisurface mesh.
So I turn to use ug and blender,but then I found another problem.the exported stl files is ok,and the surfaceFeatures option was done successful,but when I do the snappyHexMesh,there comes a fatal error with the emsh file,which CAD and solidworks didn't give.
Sorry I cannot upload pictures,but here's the error output:
--> FOAM FATAL IO ERROR:
"ill defined primitiveEntry starting at keyword 'object' on line 14 and ending at line 14"

file: /home/dyfluid/OpenFOAM/dyfluid-8/run/fpso/constant/triSurface/1.eMesh at line 14.

From function void Foam:

rimitiveEntry::readEntry(const Foam::dictionary&, Foam::Istream&)
in file db/dictionary/primitiveEntry/primitiveEntryIO.C at line 168.

FOAM exiting

So does anyone know where the problem is?Is it from the emesh file?Or the stl file？Or from modeling procedure?
Thanks all!

Drew.M · July 8, 2022, 18:39

I am having the same issue. if anyone can help would be greatly appreciated!

PassengerC07 · July 15, 2022, 05:04

I don't know what you intend to do with emesh but you can extract the emesh from STL files with an OpenFOAM command ( surfaceFeatureExtract ).

You can find more info on this utility in the tutorial of snappyHexMesh here:

http://www.wolfdynamics.com/wiki/meshing_OF_SHM.pdf

March 25, 2021, 20:16	finding problems with emesh file	#1
ptw1995 New Member piaotaiwei Join Date: Mar 2021 Posts: 1 Rep Power: 0	Hello everyone,I'm trying to export stl files from 3d modeling sofwares. I've found that when CAD and solidworks export stl files,they'll turn all the coordinates into a positive value,which makes my blockmesh cannot intersect with my trisurface mesh. So I turn to use ug and blender,but then I found another problem.the exported stl files is ok,and the surfaceFeatures option was done successful,but when I do the snappyHexMesh,there comes a fatal error with the emsh file,which CAD and solidworks didn't give. Sorry I cannot upload pictures,but here's the error output: --> FOAM FATAL IO ERROR: "ill defined primitiveEntry starting at keyword 'object' on line 14 and ending at line 14" file: /home/dyfluid/OpenFOAM/dyfluid-8/run/fpso/constant/triSurface/1.eMesh at line 14. From function void Foam:rimitiveEntry::readEntry(const Foam::dictionary&, Foam::Istream&) in file db/dictionary/primitiveEntry/primitiveEntryIO.C at line 168. FOAM exiting So does anyone know where the problem is?Is it from the emesh file?Or the stl file？Or from modeling procedure? Thanks all!

July 8, 2022, 18:39	Same problem	#2
Drew.M New Member Andrew Mills Join Date: Oct 2019 Posts: 6 Rep Power: 6	I am having the same issue. if anyone can help would be greatly appreciated!

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July 15, 2022, 05:04		#3
PassengerC07 New Member Join Date: Jul 2022 Posts: 6 Rep Power: 3	I don't know what you intend to do with emesh but you can extract the emesh from STL files with an OpenFOAM command ( surfaceFeatureExtract ). You can find more info on this utility in the tutorial of snappyHexMesh here: http://www.wolfdynamics.com/wiki/meshing_OF_SHM.pdf