CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   CD-adapco (http://www.cfd-online.com/Forums/cd-adapco/)
-   -   Ultra high temperature? (http://www.cfd-online.com/Forums/cd-adapco/54726-ultra-high-temperature.html)

bk July 18, 2005 04:03

Ultra high temperature?
 
I am using sorsca.f and sorent.f to consider of scalar genetraion due to high temperature( more than 1.0e6K) with the option-multi component specific heat, viscosity etc... But Looking at star.info, I found the follwing message;

|----------------------------------|

| DOMAIN: star_0001 |

|----------------------------------|

TIME STEP = 4; ELAPSED TIME = 0.800000E-10 s; TABLE/USER CODING

---------------------------------------------------------------------

*** WARNING #090 *** VALUE ELOG*YPLUS OR ELOG*EFFVIS/(CAPPA*VISCOS) IS LESS THAN 1.1 AT 100 CELLS.

UPLUS=YPLUS LAW IS USED. IF THIS SITUATION PERSISTS, INCORRECT RESULTS MAY BE OBTAINED.

*** WARNING #090 *** VALUE ELOG*YPLUS OR ELOG*EFFVIS/(CAPPA*VISCOS) IS LESS THAN 1.1 AT 100 CELLS.

UPLUS=YPLUS LAW IS USED. IF THIS SITUATION PERSISTS, INCORRECT RESULTS MAY BE OBTAINED.

MAXIMUM COURANT NUMBER = 1.154E-03 AT CELL 7900 MEAN COURANT NUMBER = 1.130E-04

*** WARNING #007*** SETTING T AT CELL 7501 FROM 8.285E+04 TO 2.000E+04

*** WARNING #007*** SETTING T AT CELL 7502 FROM 5.168E+04 TO 2.000E+04

*** WARNING #007*** SETTING T AT CELL 7503 FROM 3.122E+04 TO 2.000E+04

*** WARNING #007*** SETTING T AT CELL 7701 FROM 8.296E+04 TO 2.000E+04

*** WARNING #007*** SETTING T AT CELL 7702 FROM 5.175E+04 TO 2.000E+04

*** WARNING #007*** SETTING T AT CELL 7703 FROM 3.126E+04 TO 2.000E+04

*** WARNING #007*** SETTING T AT CELL 7901 FROM 8.296E+04 TO 2.000E+04

*** WARNING #007*** SETTING T AT CELL 7902 FROM 5.175E+04 TO 2.000E+04

*** WARNING #007*** SETTING T AT CELL 7903 FROM 3.126E+04 TO 2.000E+04

*** WARNING #007*** SETTING T AT CELL 8101 FROM 8.296E+04 TO 2.000E+04

*** WARNING #007*** SETTING T AT CELL 8102 FROM 5.175E+04 TO 2.000E+04

*** WARNING #007*** SETTING T AT CELL 8103 FROM 3.126E+04 TO 2.000E+04

*** WARNING #007*** SETTING T AT CELL 8301 FROM 8.296E+04 TO 2.000E+04

*** WARNING #007*** SETTING T AT CELL 8302 FROM 5.175E+04 TO 2.000E+04

*** WARNING #007*** SETTING T AT CELL 8303 FROM 3.126E+04 TO 2.000E+04

*** WARNING #007*** SETTING T AT CELL 8501 FROM 8.285E+04 TO 2.000E+04

*** WARNING #007*** SETTING T AT CELL 8502 FROM 5.168E+04 TO 2.000E+04

*** WARNING #007*** SETTING T AT CELL 8503 FROM 3.122E+04 TO 2.000E+04

Why do these message occurs????????????

My calcualtion informations are - compressible flow - turbuletnt option ON - Courant number is satisfied during simulation - Scalars are ION, ELE, and theses scalars are "active"


John Luo July 18, 2005 07:44

Re: Ultra high temperature?
 
You have hit the maximum T limit setting internally in STAR-CD, use Real-Constant 90 to change the set (in Nav-Center, Analysis Controls=>Other Controls=>Switches and Real Constants. After setting R90, write the probe file again (prob).

bk July 19, 2005 01:01

Re: Ultra high temperature?
 
Thank you John. I solved my problem about warning message in *.info file. Hmm... How do you know that the R90 means the maximu T limit? And Do you know the meanings of the others Real-Constants?


All times are GMT -4. The time now is 22:41.