HELP: building Fluent application

quiri · October 26, 2011, 11:48

Hi,

I state that I use Fluent just from 2 weeks and I just registered in this forum.

I have to analyze the air flow in a storic building. This flow is generated by the temperature gap (hence by the pressure gap) between two points in the building. So I draw a 3D model with my building, placed inside an air box that intersects the ground (to simulate the atmosphere around the building). If necessary I will make larger this box to be sure it doesn’t affect the fluid flow.

What's the best way to set the boundary conditions in my case? I talk about the walls of my box: have I to set them as "wall" (with a temperature equal to the atmosphere one)? Or is there any option to simulate the condition of wall traversed by the fluid flow (that can enter or exit)?

Sorry for my bad english,
thanks in advance

Quiri

PS: i will make the "mesh" with Ansys ICEM CFD, and I will use a tetrahedral module (i think this is the easiest way).

amir.mofakham · October 26, 2011, 13:13

Hi
I think u can use pressure outlet for the walls of the box.
I suggest u do not use tetrahedral, this module is not accurate enough in addition in that you want to simulate air of a building, you should try to decrease the number of the mesh and hex mesh will be better for this problem.
Mesh is very important for any problem so take notice to it.

pstreufert · October 27, 2011, 11:35

You need to set a Pressure Far-field boundary condition rather than inlet/outlet for the "box". Read the user's guide to see how to set it up - you need to use the ideal gas law for density calculation for it to work, plus there are a few other limitations. I used it to model wind blowing over a large building at various angles.

October 26, 2011, 11:48	HELP: building Fluent application	#1
quiri New Member Quirino Mario Picone Join Date: Oct 2011 Posts: 1 Rep Power: 0	Hi, I state that I use Fluent just from 2 weeks and I just registered in this forum. I have to analyze the air flow in a storic building. This flow is generated by the temperature gap (hence by the pressure gap) between two points in the building. So I draw a 3D model with my building, placed inside an air box that intersects the ground (to simulate the atmosphere around the building). If necessary I will make larger this box to be sure it doesn’t affect the fluid flow. What's the best way to set the boundary conditions in my case? I talk about the walls of my box: have I to set them as "wall" (with a temperature equal to the atmosphere one)? Or is there any option to simulate the condition of wall traversed by the fluid flow (that can enter or exit)? Sorry for my bad english, thanks in advance Quiri PS: i will make the "mesh" with Ansys ICEM CFD, and I will use a tetrahedral module (i think this is the easiest way).

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Two questions on Fluent UDF	Steven	Fluent UDF and Scheme Programming	7	March 23, 2018 04:22
problem of running parallel Fluent on linux cluster	ivanbuz	FLUENT	15	September 23, 2017 20:12
Abaqus - Fluent Coupling WITHOUT MPCCI	s.mishra	FLUENT	1	April 5, 2016 07:47
What the differences flow equation of Fluent 6.3 and Fluent 12.1	opehterinar81	FLUENT	0	August 19, 2011 12:55
FLUENT application (electronics cooling with PCM)	Win Win Maw	FLUENT	1	January 30, 2006 06:10

October 26, 2011, 13:13		#2
amir.mofakham New Member amir mofakham Join Date: Feb 2011 Posts: 14 Rep Power: 15	Hi I think u can use pressure outlet for the walls of the box. I suggest u do not use tetrahedral, this module is not accurate enough in addition in that you want to simulate air of a building, you should try to decrease the number of the mesh and hex mesh will be better for this problem. Mesh is very important for any problem so take notice to it.

October 27, 2011, 11:35		#3
pstreufert New Member PS Join Date: Aug 2011 Posts: 13 Rep Power: 15	You need to set a Pressure Far-field boundary condition rather than inlet/outlet for the "box". Read the user's guide to see how to set it up - you need to use the ideal gas law for density calculation for it to work, plus there are a few other limitations. I used it to model wind blowing over a large building at various angles.