CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

pressure distribution in a closed container

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   December 17, 2003, 00:13
Default pressure distribution in a closed container
  #1
prasanth
Guest
 
Posts: n/a
HAI,

1).In a closed cylindrical tank completely filled with liquid, if we give intial pressure distribution of static head using custom field functions, it was taking the profile while patched. When on heating on cylindrical surface(i.e., during iteration), pressure is going to normal operating conditions, i.e. in the range of atm. pressure...why is it so? is it not taking initial condition?

2) One more thing, In tha above case, a little positive gradient is achieved in pressure along height, which is acceptable. but when patch liq heiht only to 80% and remaing 20% with vapor,also same as above, but it is showing -ve gradient towards interface and going in +ve direction from there to the top? why its happening like that?

Advance thanks for any kind information.

Prasanth

  Reply With Quote

Old   December 17, 2003, 12:01
Default Re: pressure distribution in a closed container
  #2
prasanth
Guest
 
Posts: n/a
I guess people have not understood my query. Let me say in another way:

1) take an axisymmetric model of a cylindrical tank. take that it is fully filled with liquid. now taking all the steps for natural convection, by applying constant heat flux on side-wall, etc.;create a custom field as rho*g*(height-coordinate in g dir)(i,.e., rho*g*h].patch this custom field as pressure on the fluid zone after initializing. then see the pressure profile along the axis. now after some iterations again see the pressure profile. I observed as it going in the range of operating pressure instead of taking the patched pressure distribution as initial stage.

So, can you sort out my problem. If any understand this, I will post my second question

Thanks in Advance Prasanth
  Reply With Quote

Old   December 21, 2003, 07:52
Default Re: pressure distribution in a closed container
  #3
Venkatesh
Guest
 
Posts: n/a
I feel you have not swithced on the gravity.
  Reply With Quote

Old   December 21, 2003, 08:21
Default Re: pressure distribution in a closed container
  #4
prasanth
Guest
 
Posts: n/a
without gravitation, we cant simulate natural convection. i have selectewd it. with regds prasanth
  Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
"Pressure Inlet" Boundary Setup Wijaya FLUENT 15 May 18, 2016 11:08
Pulsatile pressure inlet with pressure outlet a.lynchy FLUENT 3 March 23, 2012 14:45
Pressure Rise Error emueller CFX 0 May 5, 2009 12:08
plot pressure distribution on a section of 3D wing ROOZBEH FLUENT 3 April 21, 2008 04:30
Hydrostatic pressure in 2-phase flow modeling (CFX4.2) HB &DS CFX 0 January 9, 2000 14:19


All times are GMT -4. The time now is 06:45.