CFD notes

Originally Posted by alberto

Hi,

both limitedLinear and linearUpwind are bounded. What is different is how the boundness of the scheme is obtained (see table 4.10 of User's guide).

• limitedLinear is the linear scheme stabilized with the introduction of a limiter (Sweby limiter)
• linearUpwind in an upwinded scheme

About their accuracy, limitedLinear is in my experience slightly less diffusive, but I had good results with both the schemes.

I believe the second order upwind scheme in commercial

Originally Posted by chegdan

I am a writing about the schemes that I used in my simulations in my thesis and could use some clarification on the linearUpwind and limitedLinear schemes. I have read http://www.cfd-online.com/Forums/ope...r-schemes.html and Alberto did a good explanation, but I need a little more clarification.

linearUpwind:

I know linearUpwind is second order and bounded by a limiter (e.g. cellMDLimited from http://www.cfd-online.com/Forums/ope...lllimited.html).

Originally Posted by stevenvanharen

Just deleting is not a good idea. Just use stitchMesh.

After using stitchMesh you will see the boundaries are still present in the boundary file bu they will contain 0 faces. You can just delete them from this file in this case (don't forget to change the number of boundaries at the top of the boundary file).