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August 29, 2017, 10:45 |
AC Duct
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#1 |
New Member
Claudio
Join Date: Aug 2017
Posts: 3
Rep Power: 8 |
Here's my problem explained very simply...
At this moment, I’m developing a new air condition duct for a bus. As you can see on the picture attached, we have an evaporator on the top / middle of the duct. The model I created converges well if I use a simple "mixing length" turbulence model But as soon as I start using a k-e model, it doesn't converge: I think that I calculated correctly the turbulence length scale and energy using the formulas found on this very site. So my questions are: - Is the Mixing length model really not good enough for this kind of study? - Is the k-e model appropriate for such kind of AC duct study or not? (I saw that some people were raising doubts about this model usage to study the flow into ducts) - Is there another more appropriate model? I would like to add that I tried various mesh sizes and velocity speed for the inlet and the only reason It doesn't converge seem to be the k-e model. I have some doubts also regarding the type of wall condition that I should use to work with this k-e model. Could the problem be related to the definition of wall boundary I am using? |
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August 29, 2017, 20:35 |
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#2 | |
Senior Member
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Quote:
2. adjust your wall function method. 3. what is your grid density and quality. 4. improve the orthogonality of grid near the wall. |
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