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October 31, 2012, 14:58 |
Near wall treatment (k and epsilon)
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#1 |
New Member
Sagnik
Join Date: Oct 2012
Posts: 28
Rep Power: 13 |
Hi, I want to set dk/dn = 0 and depsilon/dn = 0 at the walls in Fluent where 'k' = turbulent kinetic energy and 'epsilon' is the rate of dissipation of turbulent kinetic energy. I wonder if it can be done !
Thanks Sagnik |
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November 1, 2012, 01:55 |
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#2 |
Senior Member
Join Date: Mar 2011
Location: Germany
Posts: 552
Rep Power: 20 |
Yes. it can be done with the help of UDF
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November 1, 2012, 02:57 |
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#3 |
Super Moderator
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What are the default boundary conditions in Fluent for these variables at wall? And why you want to set these boundary conditions?
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November 1, 2012, 10:02 |
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#4 |
New Member
Sagnik
Join Date: Oct 2012
Posts: 28
Rep Power: 13 |
Hi cfd seeker, I understand there is a udf function called "DEFINE_WALL_FUNCTIONS". But that does not allow you to specify gradients of k and epsilon. Can you be a bit more specific about what UDF and whether you have seen anybody implementing it?
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November 1, 2012, 10:44 |
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#5 |
New Member
Sagnik
Join Date: Oct 2012
Posts: 28
Rep Power: 13 |
Hi far,
The default boundary conditions can be viewed at: http://hpce.iitm.ac.in/website//Manu...ug/node510.htm For the test case that we are designing we want to see whether it is important to model the wall properly to get the global flow features right ? Thanks Sagnik |
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