[mallikarjuns88]

Hi,
I want to apply variable time step in starCCM.
eg. from 0 to 0.3 s - Time step size of 0.5 e-03
from 0.3 to 0.7 s - Time step size of 1.0 e-02
from 0.7 to 1.0 s - Time step size of 0.5 e-03.
Total physical time - 1.0 s.
How to apply this condition ? Can any one help me on this ?

[Jonass19]

Just define a scalar user field function or scalar parameter:

Name: TSS
Definition: $Time < 0.3 || $Time > 0.7 ? 0.5e-03 : 1.0e-2
Set the variab under Solvers -> ... > Timestepsize via ${TSS}

[mallikarjuns88]

thanks jonass19, It works perfectly for me.

Thanks