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SST model computation diverge after thousands of iterations

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Old   October 17, 2013, 02:59
Default SST model computation diverge after thousands of iterations
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Dear everyone!Now a FLUENT problem occured to me!The computation details are at below.
My computation model is a teardrop shaped vortex generator.I set the front and back faces as periodic boundary condition and set the mass flow rate for it.The two sidewalls are set to be periodic condition also.The downwall is isothermal wall boundary condition and the upwall is adiabat wall. When I start the computation,the residual first decreased quite well.
But when it is nearly converged,the residual start to enhance rapidly.I have tried many methods to prevent it but none works.By the way,I have computed some other shaped vortex generator like sphere and eliptical with the same mesh.They all converged quite well.
I hope someone can help me solve this problem.It puzzled me so long time.Thank you in advance.
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