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The directionMixed Boundary Condition

Posted June 7, 2012 at 10:53 by Hisham (Notes for OpenFOAM!)
Updated June 7, 2012 at 13:45 by Hisham

A mixed boundary condition is a combination of a fixedValue (Drichilet) and a fixedGradient (Neumann) boundaries determined by a fraction value. When fraction = 1, the BC is fixedValue and when it is set to zero the BC is fixedGradient. Values in between calculate a value in between (see code).

The directionMixed BC allows changing the fraction value for different directions. Assuming a plane-strain stress analysis that needs fixation in X-direction (Dx = 0) and free Y-direction...
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Radial Turbomachinery meshing in ICEM

Posted June 2, 2012 at 05:44 by Far

In this thread, I have discussed different issues in meshing and geomtry importe related to radial turbochinary. Geomtry and blocking is also posted here. Feel free to use geomtry and blocking and let me know if you have any diffciultly to handle these type of geometries.


http://www.cfd-online.com/Forums/ans...tml#post337506
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Comparison CFD mesh software GAMBIT with ANSYS MESH

Posted May 30, 2012 at 23:35 by Guava Wang

Some experiences using GAMBIT and ANSYS MESH shares with you guys.In the last five years, I use GAMBIT for meshing model. After ANSYS being merged FLUENT into workbench, GAMBIT isn't included in this product, and it is substituted for ANSYS MESH.
The main differences are as below.
1. model process. GAMBIT can include interior zone by spliting body with surface, and that can also be set as wall.
2.mesh process. ansys mesh can automatically meshed the models...
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Constant Temperature Volumetric region

Posted May 6, 2012 at 15:33 by peterliu

how the energy equation implemented in FLUENT

Quote:
Originally Posted by evcelica View Post
Yes Glenn, that's exactly what I was saying, for example:

E.genSource = (T.desired - Temperature)*c.p*density*(1/time constant)


It still not instantly switching to the new temperature, as you still have some sort of a time constant but you can make it very very small.
What you choose as a time constant will be where it starts approaching your temperature, so you could choose 1sec or 10^-whatever
...
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Testing Engrid installer on various Distributions

Posted May 6, 2012 at 09:29 by elvis

I tested the Engrid installer

mkdir ~/Software
cd ~/Software
wget http://sourceforge.net/projects/engr...1.3/build.bash
source build.bash ubuntu-11.10

worked fine on ubuntu except for 12.04 „Precise Pangolin“
also no problems on aptosid except for aptosid 2011-03 "Πόνος"
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