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 May 15, 2012, 07:57 hi #1 New Member   nabizadeh Join Date: May 2012 Location: iran Posts: 21 Rep Power: 5 i want to simulation one house with ansys fluent 13,but i have some problem with viscosity model who can help me?the model is 3D and the wind velocity is 3m/s.plz give me the detailed i need for this model

May 15, 2012, 08:00
#2
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Quote:
 Originally Posted by eb.nabizadeh i want to simulation one house with ansys fluent 13,but i have some problem with viscosity model who can help me?the model is 3D and the wind velocity is 3m/s.plz give me the detailed i need for this model
plz help me quick thanks

 May 15, 2012, 08:05 #3 Senior Member   Join Date: May 2011 Location: Germany Posts: 130 Rep Power: 6 Could you just write some more details? What are you interested about? Where exactly is your problem? Maybe a sketch would help to understand your problem.

 May 15, 2012, 08:35 #4 New Member   nabizadeh Join Date: May 2012 Location: iran Posts: 21 Rep Power: 5 ok,my model is a 3D house that has wind catcher,the boundary condition is: inlet:velocity inlet and the amount of it's is 3m/s outletressure outlet and the amount of it's is atmospheric pressure. rest of house wall boundary condition is wall when i run the fluent i see some sentences like reverse flow or limited viscosity ... or limited temperature ... what i must do to correct it?

May 15, 2012, 08:55
#5
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 Originally Posted by eb.nabizadeh ok,my model is a 3D house that has wind catcher,the boundary condition is: inlet:velocity inlet and the amount of it's is 3m/s outletressure outlet and the amount of it's is atmospheric pressure. rest of house wall boundary condition is wall when i run the fluent i see some sentences like reverse flow or limited viscosity ... or limited temperature ... what i must do to correct it?
thaaaaaaaaaaaaaaaaaanks

May 15, 2012, 09:34
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 Originally Posted by eb.nabizadeh thaaaaaaaaaaaaaaaaaanks
one person give my answer

 May 15, 2012, 09:55 #7 Senior Member     Flavio Join Date: Sep 2011 Location: Brescia, Italy Posts: 181 Rep Power: 5 Hi first of all I think that there isn't any thermal boundary condition so you should disable the Energy equation (so that the temperature will not be calculated) The message "reverse flow..." means that the flow direction is opposite to the output: this isn't a problem if the number of the cells with this flow decreases during the iterations (try waiting after hundreds of iterations what happens) Best regards

 May 15, 2012, 10:08 #8 New Member   nabizadeh Join Date: May 2012 Location: iran Posts: 21 Rep Power: 5 thanks dear.and do u think whats the best viscose model and if i want to use radiation what is the best model for this simulation?

 May 15, 2012, 10:39 #9 Senior Member     Flavio Join Date: Sep 2011 Location: Brescia, Italy Posts: 181 Rep Power: 5 ok, I was wrong: if you have to use a radiation model the energy equation must be selected - Viscous: I think that a simple standard k-epsilon model can be suitable in your case - I'm sorry but with radiation fenomena I haven't much experience: I only know that the most complex model is DO, but I think that in your case you can select a simpler one

 May 20, 2012, 07:55 #10 New Member   nabizadeh Join Date: May 2012 Location: iran Posts: 21 Rep Power: 5 i have one question,my model is transient and i want to see the answer in different time what i must do?

May 20, 2012, 07:56
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Quote:
 Originally Posted by eb.nabizadeh i have one question,my model is transient and i want to see the answer in different time what i must do?
thankssssssssss

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