Solving k-e model -- CFD Online Discussion Forums

December 9, 2010, 18:54	Solving k-e model	#1
Picknikka New Member Alexander Ruth Join Date: Dec 2010 Posts: 1 Rep Power: 0	Hi, I am writing a code with FORTRAN to solve the k-e model. I have a Problem with the eddy viscosity formulation. The flow I like to predict is one over a rotating disc. This flow is considered to disappear in the infinty and so at the end of the grid (far away from the disc) too. So k and e become zero far away from the disc....my problem is that in formulation of the eddy viscosity for the k-e model i have to calculate k²/e....and this causes problems because k is in the infinity 1+10^-30 and e is 1*10^-33....so k²/e is becoming something like 1000 but it should be zero. Has anybody an idea how I can solve this? Thanks! Alex

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