[Lt72884]

Ok, so i am pratcing a new cfd case and i do not have errors, but i think my work flow is not so hot and im getting bad results.

I am testing a new rocket fin can in cfd at speeds of 455 MPH and a mach number of 0.68


I modeled the can in freecad. i put a 2m by 2m by 2m box around the fin can. I then created a compound NOT a cut out.

i then switch to the CFDOF workbench in freecad.

I am using cfmesh with 75mm base mesh and a refinement of 0.4 around the volume of my solid compound. I also tried 0.75 with same results.

Once the mesh has been created i load it in paraview and its terrible looking. I make a simple cut in the center and i cannot even see my fin can.

i run the solver anyway and the cut view looks just as bad.


Does making the compound only work in certain cases? should i always cut the part out of the flow domain?

i tired with a smaller mesh and still bad results.

what is the best way to cfd this fin can? my flow box is 2m cube

thanks

openfoam is the solver, i just set everything up in freecad cfd workbench. The mesh just looks so blocky and terrible.


I even tried 0.9 on refinement and it all looks the same.

I tried snappymesh which i dont understand why i need to search for a "point" ?

[rocketLauncher]

Hello,

If you are using cfmesh, you have to have a .fms file to run in openfoam. Depending on the angle you used to capture the surface when you generate the .fms file, you will find your geometry to look textured/damaged or well conveyed. So the first point would be to check that.

Secondly, you could also try to reduce the global mesh size and play with the parameters of meshDict.

For more specific answers, you might need to post your case study files.

I hope this helps. Best of luck