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Iterations doesn't start

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Old   August 13, 2011, 00:04
Default Iterations doesn't start
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Srikar Sai
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Hello there ,

I am running an LES flow simulation around a cylindrical tank using Star CCM+ ver 5.04. While setting up the turbulence , I choose Reynolds stress + Length scale as a turbulence specification. Where , both are coded as respective field functions. However , If I specify the length scale to be taken from the field function , the solution does not start iterating at all. The length scale has been obtained from a previous simulation where the tank height and domain dimensions were very similar to the current simulation , so instinctively it should work.
If I specify a constant length scale , the simulation starts iterating and solves without a problem.

Just to check , I ran the simulation with SA model by using same length scale field function and it works fine.

Any help on why this is happening and how to fix it would be appreciated.

Thanks
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