CFD Online Discussion Forums

Alt to funkySetFields, setFields OF - setExpS _ setExpV

Posted September 25, 2021 at 05:28 by Fluidentity13

Tags initial field, math expression, scalar, vector

./setExpS ./setExpV
Alt for funkySetFields-swak4Foam with easy setup for setting initial Scalar or Vector fields using a math expression.

https://github.com/Fluidentity/setExpS_V

C++ program to set initial fields of an OpenFOAM scalar or
vector using a math-expression, taking co-ordinates as
parameter. The expressions are based off of exprtk library
by Arash Partrow. Check the link beneath for more info.
readme.txt file describess...

Fluidentity13

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Monthly informal OpenFOAM meeting

Posted September 17, 2021 at 14:38 by hoehnp

Hello everyone,

I am happy to announce the next occasion of the monthly meeting on the 15th of October 2021 at 16:00 German Time (UTC+2).

Login details can be found here.

Everybody is welcome.

See you there.
Patrick

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Remove cells from blockMesh using topoSet + subsetMesh.

Posted September 10, 2021 at 17:16 by frantov

Remove elements from a mesh

Steps:
1. Generate whole sphere mesh using blockMesh See tutorials/mesh/blockMesh/sphere

2. Delete half sphere mesh using topoSet + subsetMesh.
3. Step 2 generates an "oldInternalFaces", checkMesh, fails. Then I use createPatch to set "oldInternalFaces" as wall. checkMesh OK.
4. Use topoSet to generate an inlet using a cylinderToCell
5. Create inlet using createPatch

To...

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checkMesh for a Hollow Cylinder

Posted August 9, 2021 at 22:23 by binyang

Create a hollow cylinder. Thanks.

Quote:

Originally Posted by zfaraday

The error shown by checkMesh only means that you forgot to define the boundary faces in your blockMeshDict file. By the way, two questions.

First one, you forgot to define one of the arcs, well actually you have defined it in a wrong way. This is the arc going from point 15 to point 8 that you have defined it from 15 to 0.

Second question, why are you using such an amount of blocks to create a cylinder? You can do it

...

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Why COMSOL use FEM instead of FVM?

Posted July 8, 2021 at 13:49 by Trailokya

Quote:

Originally Posted by mprinkey

FEM lacks a fundamental statement of conservation. FVM (and DG) are axiomatically conservative based on face flux integrals. FEM is defined as a minimization problem--find the solution that best reduces the Galerkin (or Least-Squares) residual of this system. For solid mechanics, that minimization statement makes a lot of sense--configuration of solid mechanical systems map nicely to variational formulations. Conservation equations, however, do not.

For simple flow physics, the

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