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OpenFoam, SALOME, all free tools for engineers
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second order schemes

Posted August 28, 2013 at 11:43 by skeptik (CFD notes)

Quote:
Originally Posted by alberto View Post
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
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Old

A few simple questions about linearUpwind and limitedLinear

Posted August 28, 2013 at 11:36 by skeptik (CFD notes)

Quote:
Originally Posted by chegdan View Post
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).
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Old

Mesh OK!

Posted August 23, 2013 at 04:53 by skeptik (CFD notes)

13e6 elements with SALOME (4 core CPU, 8Gb, Linux)

10e6 - tetra,
3e6 - prism layers.

Meshing time is about 2 hours.

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Old

Remove internal patch(es): mergeMesh + stitchMesh

Posted August 20, 2013 at 02:58 by skeptik (CFD notes)

Quote:
Originally Posted by stevenvanharen View Post
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).
One time i've forget to change the number of boundaries
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Old

Foam vs Van Dyke, 3D, wing

Posted August 19, 2013 at 08:20 by skeptik (CFD notes)

Got results about wing in aerodynamic tube.
Pretty good compare to experiemental obtained from An Album of Fluid Motion

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