Solve divergence for the PISO algorithm in unsteady solution (ANSYS FLUENT)

RukRuk Member
edited November 23 in Fluids

hello to all


I'm doing an unsteady simulation for the delta wing in the Fluent. I compared PISO and SIMPLE-C algorithms in this investigation. Since Fluent offers to use the PISO algorithm for transient flow but the solution was diverging for this algorithm and the system gave a floating-point error. In contrast, the solution was convergent in the SIMPLE-C method. I don't know why the PISO algorithm is inefficient at this unsteady project (Contrary to Fluent's suggestion). Time step adjusted about 0.0002 s. I used to see the same question in a different place but I did not get the right answer.


Also, when I used Extrapolate Variables the solve was diverging for both algorithms.


please guide me.


Thanks

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