Q. I am doing a FLOTRAN analysis with the incompressible formulation. I am using artificial viscosity to stabilize the flow. Do I have to eventually reduce it to zero to get a valid result?

A. No. It is advisable, however, to reduce it to the order of magnitude of the effective viscosity for a turbulent case and within an order of magnitude of a laminar case. The units of Artificial Viscosity are the units of fluid dynamic viscosity (NOT kinematic viscosity).


Q. I am doing a FLOTRAN analysis with the incompressible formulation. I am using artificial viscosity to stabilize the flow. Do I have to eventually reduce it to zero to get a valid result?

A. No. It is advisable, however, to reduce it to the order of magnitude of the effective viscosity for a turbulent case and within an order of magnitude of a laminar case. The units of Artificial Viscosity are the units of fluid dynamic viscosity (NOT kinematic viscosity).





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