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convergence problem in RNG k-e model

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Old   October 14, 2010, 11:43
Default convergence problem in RNG k-e model
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Piyush Jain
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i am doing analysis of a S-shaped diffuer with rectangular inlet and outlet (turbulent flow ).i am using the RNG k-e turbulence model and second order upwind scheme.i hav run about 15000 iterations but the residuals for k and e are not falling below 10e-2.i want them to come down to at least 10e-4.i have tried reducing the under relaxation factors to about 50% but still no improvement.i would be highly greatful if nyone could suggest me what shall i do to get desired results.
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