Tunnel ventilation

rahim · September 26, 2011, 11:37

Hi there,
I am working on the ventilation of highway tunnel using two jetfans. I constructed a large tunnel and inserted two jetfans within the tunnel.But I do not know which boundery conditions are appropriate for jetfans. Does anyone know?

rahim · September 26, 2011, 11:38

Hi there,
I am working on the ventilation on highway tunnel using two jetfans. I constructed a large tunnel and inserted two jetfans within the tunnel.But I do not know which boundery conditions are appropriate for jrt fans. Does anyone know?

pstreuf · September 26, 2011, 14:58

You can just use the Fan boundary condition if you have fan curves. What info do you have about the fans? Do you need to model the fan swirl, or what exactly?

rahim · September 26, 2011, 18:06

Dear Streufert
Tank you for your reply. I should say that I never want to consider what happen inside the fan(or fans). I just want to consider the effects of pressure jump inside the tunnel by fans. As I said I constructed a large flow domain as a tunnel media. After that, I subtaracted the fan volume from the tunnel volume. So, now I have a single volume. On the other hand I have the required fan mass flow rate and also the value of the pressure jump for each fan. But for which bouandaries they will be applied? Does it need to model as a FAN MODEL or not? Tank you for your attention.

zay7065346 · December 11, 2018, 01:55

hello, i read a paper about tunnel ventilation. the boundary condition should be inlet, outlet and fan . i hope this reply will be help

September 26, 2011, 11:37	Tunnel ventilation	#1
rahim New Member Rahim Join Date: Jul 2010 Posts: 6 Rep Power: 15	Hi there, I am working on the ventilation of highway tunnel using two jetfans. I constructed a large tunnel and inserted two jetfans within the tunnel.But I do not know which boundery conditions are appropriate for jetfans. Does anyone know?

September 26, 2011, 11:38	ventilation of tunnel	#2
rahim New Member Rahim Join Date: Jul 2010 Posts: 6 Rep Power: 15	Hi there, I am working on the ventilation on highway tunnel using two jetfans. I constructed a large tunnel and inserted two jetfans within the tunnel.But I do not know which boundery conditions are appropriate for jrt fans. Does anyone know?

September 26, 2011, 18:06	Reply to Streufert	#4
rahim New Member Rahim Join Date: Jul 2010 Posts: 6 Rep Power: 15	Dear Streufert Tank you for your reply. I should say that I never want to consider what happen inside the fan(or fans). I just want to consider the effects of pressure jump inside the tunnel by fans. As I said I constructed a large flow domain as a tunnel media. After that, I subtaracted the fan volume from the tunnel volume. So, now I have a single volume. On the other hand I have the required fan mass flow rate and also the value of the pressure jump for each fan. But for which bouandaries they will be applied? Does it need to model as a FAN MODEL or not? Tank you for your attention.

December 11, 2018, 01:55	tunnel fan	#5
zay7065346 New Member Zhang aoyu Join Date: Jul 2018 Posts: 1 Rep Power: 0	hello, i read a paper about tunnel ventilation. the boundary condition should be inlet, outlet and fan . i hope this reply will be help

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
CFX Cable Tunnel Modelling	ibrahim.mohamed	CFX	4	May 3, 2010 07:49
how to consider perforated wind tunnel wall in CFD simulation	littlelz	CFX	4	June 11, 2009 05:51
Question about Tunnel Ventilation!	Stefanos	Main CFD Forum	4	December 26, 2006 05:38
Simulating a GÃ¶ttingen type wind tunnel in FLUENT	Chris	FLUENT	3	December 4, 2006 17:33
Virtual Wind Tunnel in FLUENT	ND	FLUENT	0	April 7, 2006 07:43

September 26, 2011, 14:58		#3
pstreuf New Member Patty Streufert Join Date: Jun 2009 Location: Millstadt, IL Posts: 4 Rep Power: 16	You can just use the Fan boundary condition if you have fan curves. What info do you have about the fans? Do you need to model the fan swirl, or what exactly?