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

Truck brake chamber transient simulation - Moving boundary

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 21, 2009, 20:24
Default Truck brake chamber transient simulation - Moving boundary
  #1
New Member
 
Srivatsan
Join Date: Jul 2009
Posts: 2
Rep Power: 0
vatsa is on a distinguished road
I need assistance in performing transient simulation for pressure inside a truck brake chamber.

Geometry :
Please refer the schematic below for initial and final states of the system.
Ignore the bolts, springs etc. Moving part is the red coloured plate attached to the diaphragm

Undeformed:

Fully extended


Input:
I have measured data of mass flow rate vs time (total time = 30secs)as input to the system. Say m_in vs t.

Moving boundary:
I have measured data of the pushrod extension (red colour) vs time. Call xb vs t (again 30secs).
All in all, I have m_in and xb values as sample points sampled at 2ms for 30secs.

Problem:
a) I need to know how to write an UDF for the mass flow rate input and the moving boundary data xb (the output).
With these two given, I need to solve for the Pressure developed inside the chamber as a function of time.

b) Max movement of xb is 2.25 inches. I need to have a dynamic mesh so that the flow domain is enlarged corresponding to the movement of the boundary at each time step.

c) Medium is compressed air.

kindly give suggestions for implementing a) and b)
Thanks for your time

Srivatsan

Last edited by vatsa; July 22, 2009 at 08:01.
vatsa is offline   Reply With Quote

Reply


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
How to set boundary layer of a moving body in GAMBIT to a mesh zone for dynamic mesh tomyangbath FLUENT 18 October 12, 2016 07:57
Continuing transient simulation Dre CFX 3 February 6, 2008 06:41
Internal flow simulation boundary conditions Kishore FLUENT 1 July 10, 2007 12:42
Pressure boundary in transient simulation Nyatoto CFX 0 June 27, 2003 08:27
moving boundary and pressure M. Engel Main CFD Forum 0 September 20, 2001 04:28


All times are GMT -4. The time now is 20:50.