Fluid Flow

Janko

Hi all,
In your tutorial book exists example of fluid flow around cylinder (page 67). Usually, in all aerospace books and templates thad cylinder has rotation (that is example for wing simulation).Is it possible to do same think in Mecway?
Thanks

Victor

Hello Janko

While this is possible, it can be a little tricky to specify the boundary conditions. Use the 2D Navier-Stokes analysis type which allows velocity boundary conditions for a no-slip condition at the cylinder.

Here is an example. As you can see it requires individual velocity values for every node on the cylinder. I generated that data using a spreadsheet and pasted it directly into the liml file because it's easier than manually entering so many values by hand.

Be aware that it can only solve for laminar flow and the solver will typically fail if the Reynolds number is too high. Also, this example only has a coarse mesh so the results are probably not accurate.

If you then want to calculate the lift, you'll also have to integrate the pressure yourself too. Again a spreadsheet might be helpful.

Janko

Thank you very much, it is helpful.

German

Victor,
I tryed to refine this example defining velocities on the cylinder surface by formula, but Mecway doesn't support formula depending on node coorinates for this type of analysis.
Is it possible to support this kind of formula in a future version?

thank you