hi Joe, i saw in a archived forum following conversation:

My calculation is a coupled unsteady problem. After several periods, if the result is not meet the conditions of convergence,the calculation will be restarted from t=t0. Now , my question is ---

"How can I re-set the iterated time to the start time t0 in fluent UDF?"

reply:

Hi! you have to type in the TUI: (rpsetvar 'flow-time 0)

(NOTE: you have to type the parentheses too!) Now I try to do that using a UDF and let you know. Luca

what's your idea about it?

Running (rpsetvar 'flow-time 0) in the TUI will not magically revert the current stored values of velocity/pressure/ ... back to their initial values.

As far as I know you cannot revert a simulations results back to its initial guess without reloading the relevant case/dat files.

I am currently working on a problem that could really use the ability to regress one or two timesteps without going through the huge file IO penalty (particularly on clusters) of re-reading a previously saved cas/dat file. But this cant be done AFAIK ... Fluent only keeps what it needs to perform the next time step in memory.

hi joe, thank you so much for your reply. i really don't want to revert a simulations results back to its initial guess. i want to change only my current simulation time without any changig on the other variables. i want to reiterate a time step with the new data that FLUENT obtains through its current calculations.

can anyone answer my question?

Thanks in advance.