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Sliding mesh for 6 blade radial fan

kpk

I am doing sliding mesh analysis for 6 blade radial fan, while solving i am getting an error as "Severe distortion in specified mesh" i have tried with different mesh (global element size 3 and 5mm) and reducing initial time increment, can anyone know how to solve this type of error

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AcuSolve

English

v2019

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ydigit

Depending upon the preprocessor you are using, you will have to split the nodes at the interface surface between the sliding and non-sliding volumes.

If you are using AcuConsole , then right click > Mesh Op > Split internal surface (note this splitting of nodes is done after the mesh in generated and not related to the split internal surface option you see during CAD import).

If using HyperMesh,either you can use AutoWall for this surface or you could use the split nodes option in advanced options for this surface.

SimLab 2020.1 and HyperWorks2020.1 have autowall implementation and this splitting is not requried. The solver takes care of this this.

Could you post you .INP and .LOG file here?

ydigit

Also it is highly recommended to move to the latest version of HyperWorks CFD 2020.1 or SimLab 2020.1, as there are several fixes and this autowall really helps to avoid error like yours.

kpk

Thanks for the reply i am using AcuConsole2019, Split internal surface is done (for sliding surface which is fan Reference Frame fluid surface) after Mesh is completed and RUN started and stopped after only 20 iterations giving same error as mentioned above

acupro

Hi

Thanks for the reply i am using AcuConsole2019, Split internal surface is done (for sliding surface which is fan Reference Frame fluid surface) after Mesh is completed and RUN started and stopped after only 20 iterations giving same error as mentioned above

Make sure you apply the Mesh Motion both to the rotating volume and also to the fan blades themselves. On the fan surfaces, Simple BC type = wall with mesh-displacement-type = fixed, with the Mesh Motion applied/selected.

As mentioned before, if you attach the .inp file, we could further diagnose the problem.