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Kushgen

"CONSTANT TIME STEP FOR SHELL ELEMENT " message

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Hello,

 

I had a successfully running Radioss model, which I had modified by scaling down the model by a factor of 1/6 in all 3 directions X,Y and Z. When I execute a Radioss simulation with this scaled down model, the following messages are displayed

 

-- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      34785
 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      13280
 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      34648
 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      12589
 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      13006
 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      13144
 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      12867
 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      12730
 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      34786
 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      13281
 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      34649
 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      12590
 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      13007
 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      13145
 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      12868
 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      12731
 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      34787

 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      36701
 --CONSTANT TIME STEP 4N SHELL ELEMENT NUMBER     29495
 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      38574
 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      38696
 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      38799

--CONSTANT TIME STEP 4N SHELL ELEMENT NUMBER     29062
 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      38812
 --CONSTANT TIME STEP 4N SHELL ELEMENT NUMBER     30039
 --CONSTANT TIME STEP 4N SHELL ELEMENT NUMBER     28760
 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      38589
 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      38711
 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      34503
 --CONSTANT TIME STEP 4N SHELL ELEMENT NUMBER     28907

-- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER      36670
 NC=       0 T= 0.0000E+00 DT= 6.7177E-05 ERR=  0.0% DM/M= 2.0371E-02

 

The simulation runs after these messages are displayed. I'm unable to understand why I receive this constant time step message. Please give your inputs as to how to take corrective steps to prevent the same.

 

Thanks,

Kushal.

 

 

 

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Hi Kushal,

Please check the engine file for /DT/SHELL/CST card, which control the time step for shell elements. The time step becomes constant after reaching Tmin specified by the user.

 

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