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

Detailed Description

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

Reply
 
LinkBack Thread Tools Display Modes
Old   January 27, 2005, 16:38
Default Detailed Description
  #1
Arnab
Guest
 
Posts: n/a
Hello,

My Warnings are :

*** WARNING #060 *** DENSITY OUT OF BOUND DUE TO PRESSURE CORRECTION AT CELL 509895 DENSITY= 1.2515E-03 LIMITER APPLIED GIVING UP AFTER PRINTING 50 #060 WARNINGS Total number of #060 warnings: 5820

AND

*** WARNING #057 *** EQUATION OF STATE IMBALANCE AT CELL 509774 IS 1.710664E+00 EQUATION OF STATE IMBALANCE FOUND AT MORE THAN 100 CELLS - PRINTOUT OF WARNING MESSAGE STOPPED

I want to give you more details of my simulation for you and others to better understand the problem and give me suggestions.

My CASE:

1.Transient, Moving mesh (Rotor moving at 10300 rpm and stators stationary).

2 stagnation inlets and 2 pressure outlets as it is a 4 port configuration.

3. Molecular properties: Ideal f (T,P) , Constant default properties for Air in terms of Molecular viscocity, Cp, Conductivity and Molecular weight.

4. Turbulence Model - K-epsilon High Re

Thermal Models - (conservation- static enthalpy, enthalpy- thermal)

Initialization - Default Initialization flow with 0 max vel and atmosphere pressure and temp.

5 Monitoring and Reference cells at outlet with atmospheric pressure assigned.

6. Max number of corrector stages : 50

Reduction in Residual for corrector stages = 0.25

under relaxation for pressure correction = 0.01

scalar solver - method - CG

Implicit Temporal Discretization

Solving for U, V,W, Pres, Turb KE, Turb Diss, T .

Differencing schemes - UD and MARS

7. Time step : 1.21 e -10 sec.

run for 0.005825 secs

Still I am getting these warnings at all time steps for almost all the cells i guess:

*** WARNING #060 *** DENSITY OUT OF BOUND DUE TO PRESSURE CORRECTION AT CELL 509895 DENSITY= 1.2515E-03 LIMITER APPLIED GIVING UP AFTER PRINTING 50 #060 WARNINGS Total number of #060 warnings: 5820

AND

*** WARNING #057 *** EQUATION OF STATE IMBALANCE AT CELL 509774 IS 1.710664E+00 EQUATION OF STATE IMBALANCE FOUND AT MORE THAN 100 CELLS - PRINTOUT OF WARNING MESSAGE STOPPED
  Reply With Quote

Old   January 27, 2005, 16:57
Default Re: Detailed Description
  #2
Arnab
Guest
 
Posts: n/a
Also I am getting this error sometimes when I use static conditions for inlet instead of stagnation:

After 1st Iteration:

Calculation stopped due to negative densities in more than 100 cells..

Help me!!!

Arnab
  Reply With Quote

Old   January 28, 2005, 07:15
Default Re: Detailed Description
  #3
Somnath
Guest
 
Posts: n/a
u can try by reducing the residual tolarances to avoid the negative density.
  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
detailed chemistry EDC model Jimmy Andersen FLUENT 6 November 1, 2014 21:22
CFX: combustion with detailed chemistry JY CFX 2 November 24, 2005 03:25
Fluent: combustion with detailed chemistry JY FLUENT 2 October 13, 2005 16:15
Fluent: combustion with detailed chemistry JY FLUENT 0 October 12, 2005 19:09


All times are GMT -4. The time now is 17:13.