[atanuchaudhury1994@gmail.com]

Actually I was working on the “Cylinder3D”, where I created the model by Freecad. The model was a little bit large in size. I extended the Y-axis from 410 mm to 2000 mm. The Grid size becomes around 500 million. Sometimes it gets aborted or Killed. When I try to run it in GPU, I am getting this problem. :

BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[setslipBoundary] Warning: Could not setSlipBoundary (166, 60, 83), discreteNormal=(0,0,0,0), set to bounceBack
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[setslipBoundary] Warning: Could not setSlipBoundary (168, 61, 83), discreteNormal=(0,0,0,0), set to bounceBack
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[setslipBoundary] Warning: Could not setSlipBoundary (169, 60, 83), discreteNormal=(0,0,0,0), set to bounceBack
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[setslipBoundary] Warning: Could not setSlipBoundary (170, 62, 83), discreteNormal=(0,0,0,0), set to bounceBack
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[setslipBoundary] Warning: Could not setSlipBoundary (172, 63, 83), discreteNormal=(0,0,0,0), set to bounceBack
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[setslipBoundary] Warning: Could not setSlipBoundary (232, 93, 83), discreteNormal=(0,0,0,0), set to bounceBack
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[setslipBoundary] Warning: Could not setSlipBoundary (235, 94, 83), discreteNormal=(0,0,0,0), set to bounceBack
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[setslipBoundary] Warning: Could not setSlipBoundary (235, 96, 83), discreteNormal=(0,0,0,0), set to bounceBack
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[setslipBoundary] Warning: Could not setSlipBoundary (237, 99, 83), discreteNormal=(0,0,0,0), set to bounceBack
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[setslipBoundary] Warning: Could not setSlipBoundary (238, 99, 83), discreteNormal=(0,0,0,0), set to bounceBack
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[setslipBoundary] Warning: Could not setSlipBoundary (242, 99, 83), discreteNormal=(0,0,0,0), set to bounceBack
[prepareLattice] Prepare Lattice … OK
[main] starting simulation…
[setBoundaryValues] step=0; maxVel=0.005
[Timer] step=0; percent=0; passedTime=7.154; remTime=915705; MLUPs=0
[LatticeStatistics] step=0; t=0; uMax=0.005; avEnergy=2.49386e-08; avRho=1.00001
[getResults] pressure1=0; pressure2=0; pressureDrop=0; drag=0; lift=0
cylinder3d: ../../../src/utilities

I dont understand what is the issue. Is my system not able to handle the simulation or any other problem?
Please help.

[atanuchaudhury1994@gmail.com]

How did you solved the problem?

Thank you

[atanuchaudhury1994@gmail.com]

I used the setNewSlipboundary, its giving error while running in GPU but doesnot give any error in CPU:
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[prepareLattice] Prepare Lattice … OK
[main] starting simulation…
[setBoundaryValues] step=0; maxVel=0.0499999
[Timer] step=0; percent=0; passedTime=7.513; remTime=96158.9; MLUPs=0
[LatticeStatistics] step=0; t=0; uMax=0.0499999; avEnergy=2.49386e-06; avRho=1.0 0011
[getResults] pressure1=0; pressure2=0; pressureDrop=0; drag=0; lift=0
cylinder3d: ../../../src/utilities/vectorHelpers.h:204: std::vector<_Tp> olb::ut il::normalize(const std::vector<_Tp>&) [with T = float]: Assertion `scale>0′ fai led.
Aborted (core dumped)

[atanuchaudhury1994@gmail.com]

I will try Multi GPU. Sorry for the inconvience caused Sir.

Thank you

[atanuchaudhury1994@gmail.com]

[getResults] pressure1=0; pressure2=0; pressureDrop=0; drag=0; lift=0
cylinder3d: ../../../src/utilities/vectorHelpers.h:204: std::vector<_Tp> olb::util::normalize(const std::vector<_Tp>&) [with T = float]: Assertion `scale>0′ failed.
Aborted (core dumped)

This is the problem.

[atanuchaudhury1994@gmail.com]

Dear OpenLB team,

I tried to run a new model using GPU in servers. In the new model I extended the Y-axis from 410 mm to 2000 mm and also set the boundary condition to “SetSlip” boundary. When I try to run it in GPU, I am getting this problem. :

BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[setslipBoundary] Warning: Could not setSlipBoundary (166, 60, 83), discreteNormal=(0,0,0,0), set to bounceBack
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[setslipBoundary] Warning: Could not setSlipBoundary (168, 61, 83), discreteNormal=(0,0,0,0), set to bounceBack
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[setslipBoundary] Warning: Could not setSlipBoundary (169, 60, 83), discreteNormal=(0,0,0,0), set to bounceBack
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[setslipBoundary] Warning: Could not setSlipBoundary (170, 62, 83), discreteNormal=(0,0,0,0), set to bounceBack
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[setslipBoundary] Warning: Could not setSlipBoundary (172, 63, 83), discreteNormal=(0,0,0,0), set to bounceBack
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[setslipBoundary] Warning: Could not setSlipBoundary (232, 93, 83), discreteNormal=(0,0,0,0), set to bounceBack
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[setslipBoundary] Warning: Could not setSlipBoundary (235, 94, 83), discreteNormal=(0,0,0,0), set to bounceBack
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[setslipBoundary] Warning: Could not setSlipBoundary (235, 96, 83), discreteNormal=(0,0,0,0), set to bounceBack
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[setslipBoundary] Warning: Could not setSlipBoundary (237, 99, 83), discreteNormal=(0,0,0,0), set to bounceBack
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[setslipBoundary] Warning: Could not setSlipBoundary (238, 99, 83), discreteNormal=(0,0,0,0), set to bounceBack
[BlockGeometryStatistics3D] WARNING: no discreteNormal is found
[setslipBoundary] Warning: Could not setSlipBoundary (242, 99, 83), discreteNormal=(0,0,0,0), set to bounceBack
[prepareLattice] Prepare Lattice … OK
[main] starting simulation…
[setBoundaryValues] step=0; maxVel=0.005
[Timer] step=0; percent=0; passedTime=7.154; remTime=915705; MLUPs=0
[LatticeStatistics] step=0; t=0; uMax=0.005; avEnergy=2.49386e-08; avRho=1.00001
[getResults] pressure1=0; pressure2=0; pressureDrop=0; drag=0; lift=0
cylinder3d: ../../../src/utilities

What is the issue? How to solve it? Please reply

Thank you

[atanuchaudhury1994@gmail.com]

Thank you but it doesnot worked on the file made by Solidworks rather it worked with the Freecad file.

[atanuchaudhury1994@gmail.com]

ok one thing please tell me that if I use the geometry primitives (indicator functors as in the 2D example) as per the dimensions in the stl file right and then I have to change the PrepareGeometry function also right..

Thank you

[atanuchaudhury1994@gmail.com]

Dear Adrian,
I have checked all the things and saw that the measurements, origin all are as same as the previous file except I extended the Y-axis from 410 mm to 2000 mm. Do I need to make changes in the PrepareGeometry function also or I need to adjust the scaling in the stl reader argument? Please Reply.

Thank you

[atanuchaudhury1994@gmail.com]

You mean that if I change the dimensions in the stl file, do I need to make changes in the PrepareGeometry function also or I need to adjust the scaling in the stl reader argument? Please Reply

Thank you

[atanuchaudhury1994@gmail.com]

Dear ADrian,
I am confused in one thing that when I make the new file it will be an stl file. But the Openlb folder also has a ftstd file. So how to create that “ftsd” file? Will it affect the simulation?

Thank you

[atanuchaudhury1994@gmail.com]

I will try that.

Thank you

[atanuchaudhury1994@gmail.com]

Dear Adrian,
I have seen both the files, the dimenssions are same but I have extended in the Y-axis. But the origin of the files are different. Is this creating the problem? Please reply.

Thank you

[atanuchaudhury1994@gmail.com]

Do you mean I need to edit the code also also right?

[atanuchaudhury1994@gmail.com]

I have edited the post Sir.

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