CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > CD-adapco

equation of state imbalance(engine simulation)

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

Reply
 
LinkBack Thread Tools Display Modes
Old   July 4, 2002, 01:55
Default equation of state imbalance(engine simulation)
  #1
hennie
Guest
 
Posts: n/a
I am performing a simulation of a piston engine(no combustion). When the intake valve closes(It is open when the simulation starts), the cells in the intake port is changed to intake port fluid and a detachment boundary is imposed between the port cells and the cylinder cells. As soon as this fluid change and detachment occurs, the warning message of equation of state imbalance is given at the cells in the port. I am using the High Reynolds number turbulence model and temperature calculation on. The boundary at the intake port is a constant pressure and temperature boundary. Has anyone experienced this problem before, and if so can you please let me know what the solution is. By the way, I will also try to add combustion to the model later and would still like to get some advice on that. Thanx.
  Reply With Quote

Old   July 4, 2002, 03:21
Default Re: equation of state imbalance(engine simulation)
  #2
hennie
Guest
 
Posts: n/a
I'll just answer my own question on this one. I had the specific heat for the fluid in the cylinder specified by a polynomial and the fluid in the port as constant, therefore the sudden change of cells from one fluid to another, caused a discrepancy in the equation of state.
  Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Equation of state Ali FLUENT 7 February 20, 2010 09:02
Equation of state stvtiegh OpenFOAM Running, Solving & CFD 3 September 12, 2008 06:24
equation of state imbalance Ramya CD-adapco 0 November 23, 2006 00:48
gas-state-equation? abel FLUENT 0 May 6, 2006 06:08
Equation of state Edward Main CFD Forum 0 September 18, 2005 17:17


All times are GMT -4. The time now is 19:36.