Multi-region mesh using snappyHexMesh and OpenFOAM

[@vahidrabbani4419]

What a good tutorial I was having a problem understanding how to create all the mesh needed for fluid and solid regions and this video help me a lot thanks man you are amazing

[@benicovanderwesthuizen5161]

Very nice video - thank you so much !

[@matteokamenjasevic9321]

Hi, I have one issue. When I run "splitMeshRegions -cellZones" it tells me that there is only one region. Can you please help me with this. I run "checkMesh" and there is a three cellZones.

[@dakshadhikari4817]

When I run checkSurface on my combined STL, I am getting the error that the surface is not completely enclosed (when it is in the cad). Any suggestions?

[@mariarosales3535]

Hi! I tried to run this with openfoam ESI 2312, 2012 and org v9... just to confirm, this tutorial is made in of7, right?

[@hebaalaaeldin2596]

very helpful

[@aycaakboyraz9945]

Hello, may I ask why you don't have lin to the eMesh files in snappyHexMeshDict? I see that you didn't construct the surface feature edges with surfaceFeatureExtractDict.

[@cae4edu189]

That is an optional feature. If it is required to capture in more detail the feature edges it can be activated as well.

[@aycaakboyraz9945]

@@cae4edu189 thank you! I always thought that it was mandatory to do that.

[@cae4edu189]

Also, sometimes it is required to force feature edges as well, otherwise the mesh quality will be given preference and the mesh cell will not exactly conform to initial surface.

[@MrT4re]

Hi, sometimes when I do multi- region meshing with snappy, apart from the defined regions in region properties file, I get many unknown regions (up to 200 or something like that) which then cause problems later. Boundaries are then defined between those regions and my regions of interest and there are no boundary conditions defined, because in either way they should not be there. Do you have any suggestion how the creation of these unknown regions can be avoided?

[@volkanatar4232]

I have exactly the same problem man. Lots of extra "domains". Have you figured out this problem?

[@canunsal9513]

Hi. I have created a blockMesh that captures all of the faces pefectly. However, snappyHexMesh takes the bounding box as large as my fluid region so it does not capture the heater. Have you ever faced something like that?

[@cae4edu189]

Normally the blockMesh should cover everything (little bit larger). Also the mesh size in snappyHexMesh should be small enough to capture fine features.

[@dimasaji2855]

Hello, I used case heatTransfer/chtMultiRegionFoam/shellAndTubeHeatExchanger, but after I did ./Allrun, in the log.chtMultiRegionFoam have an error "Cannot find file "points" in directory "solid/polyMesh" in times "0" down to constant". How to solve it ?

[@elshadaw]

You must check your regionproperties