[Eefoe]

Hi everyone,

I'm trying to simulate flow around an airfoil by following a tutorial given here. I was able to successfully complete the tutorial and get reasonable values, but now I'm at a stage where I'm trying to modify the airfoil in the tutorial (from a NACA0015 to a NACA0012) and making the domain much smaller.

All is well until I run simpleFoam and check my results, and I end up with an anomaly in my solution: flow is going around the airfoil through the front and back of the domain:




I tried seeing what I could do in the snappyHexMeshDict file and blockMeshDict files that I used to build the domain, but I have no leads on why this is happening.

Would anyone happen to have any clue as to what the cause may be? The blockMeshDict file says that the domain is 1 cell deep, but I can't find anything in the snappyHexMeshDict that says the same thing.

[GerhardHolzinger]

Attachment 56513snappyHexMesh is a 3D mesher, there is no way to tell snappy to make a 2D mesh. However, you can create a 2D mesh by extruding one layer of cells from the appropriate patch. After extrusion, you simply throw away all other cells.

So just extend your workflow with two more additional steps.

1. snappyHexMesh
2. extrudeMesh
3. subsetMesh addedCells

Below is the 2D mesh of a cylinder in crossflow created by snappy and extrusion.

[Eefoe]

That did it for me. Thanks!