Hi friends, i am doing simulation on heat exchanger. when i am trying with Coupled algorithm, solution is easily converged. but when i am changing to PISO, iteration run for 24 iteratio(within 1min), after that no response. more than 30 min. no error like thing come. (simply as in attached file. why this occur? what to do?
Hi Saravanakumar,
May be by adjusting the URF (basically reducing them by 15-20%), you could achieve a faster convergance. Also, you can check all available Pressure-Velocity coupling schemes (SIMPLE, SIMPLEC, PISO, and Coupled) to know if this problem occurs with only the PISO scheme or others too.
Best wishes
Surendra Singh Rathore Surendra Singh Rathore sir thank you for reply, I tried with all algorithms.it is working only in coupled. In remaining all algorithms, getting the same result only difference is the number of iterations it is stuck(No response why ? ). I tried relaxation factor in all quantities as u said. Now am looking for other alternatives in coupled algorithm. because in this algorithm alteast iteration process is running.
Thanks
T.Saravanakumar