the initial condition for transient simulation
 

hi, everyone.
i am modeling a ducted fan in cfx. And i'd like to run a transient analysis using the steady state simulation as an initial guess. however, it's very hard to reach convergence in the steady state simulation, and the RMS Residual Level of velocity is about 2.2*10^-4.
Can i use this steady condition as the initial guess for the transient simulation?
thanks, any help would be appreciated!

Hi
 

Check for the mass and momentum imbalances, if they are ok then you can use the result as initial conditon for transient simulation. You can have an additional check by monitoring some integral quantity like torque.

If the problem which your simulating is inherently transient in nature, then the residuals would be oscillating and achieving convergence criteria would be difficult.

All the best:)

thank you for your reply, i will check that.