hi

eb.nabizadeh · May 15, 2012, 07:57

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

eb.nabizadeh · May 15, 2012, 08:00

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

Zigainer · May 15, 2012, 08:05

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.

eb.nabizadeh · May 15, 2012, 08:35

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
outlet

ressure 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?

eb.nabizadeh · May 15, 2012, 08:55

Quote:

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
outlet

ressure 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

eb.nabizadeh · May 15, 2012, 09:34

Quote:

Originally Posted by eb.nabizadeh

thaaaaaaaaaaaaaaaaaanks

one person give my answer

Bionico · May 15, 2012, 09:55

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

eb.nabizadeh · May 15, 2012, 10:08

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?

Bionico · May 15, 2012, 10:39

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

eb.nabizadeh · May 20, 2012, 07:55

i have one question,my model is transient and i want to see the answer in different time what i must do?

eb.nabizadeh · May 20, 2012, 07:56

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

May 15, 2012, 08:35		#4
eb.nabizadeh New Member nabizadeh Join Date: May 2012 Location: iran Posts: 23 Rep Power: 13	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, 07:57	hi	#1
eb.nabizadeh New Member nabizadeh Join Date: May 2012 Location: iran Posts: 23 Rep Power: 13	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, 08:05		#3
Zigainer Senior Member Join Date: May 2011 Location: Germany Posts: 130 Rep Power: 14	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, 09:55		#7
Bionico Senior Member Flavio Join Date: Sep 2011 Location: Brescia, Italy Posts: 181 Rep Power: 15	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
eb.nabizadeh New Member nabizadeh Join Date: May 2012 Location: iran Posts: 23 Rep Power: 13	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
Bionico Senior Member Flavio Join Date: Sep 2011 Location: Brescia, Italy Posts: 181 Rep Power: 15	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
eb.nabizadeh New Member nabizadeh Join Date: May 2012 Location: iran Posts: 23 Rep Power: 13	i have one question,my model is transient and i want to see the answer in different time what i must do?