Dear Kamil, Sorry I had missed this question. It is probably best to define kinvis non-dimensionally as you suggest. However if this is not possible for a particular mesh you have to calculate the associated Reynolds number based on the parameters of your flow. So either method is consistent. It all depends on how you have set up your mesh. Cheers, Spencer. On 2 Mar 2015, at 22:12, Kamil ÖZDEN <kamil.ozden.me@gmail.com> wrote:
Dear All,
I've a question about defining kinematic viscosity. In general I'm defining kinematic viscosity parameter in a non-dimensional way by taking both diameter and inlet velocity as 1 by dividing dimensional values of these parameters with reference velocity and length values. So kinematic viscosity becomes equal to 1/Re.
However, in aortic blood flow tutorial kinvis is calculated by taking D=3.32 mm and mean inlet velocity=1 (there is no unit specified). Is there any inconsistency in terms of units of diameter and velocity? Could you please explain how Kinvis parameter is defined in this tutorial? Is my logic true in defining Kinvis non-dimensionally?
Regards, Kamil
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Spencer Sherwin McLaren Racing/Royal Academy of Engineering Research Chair, Professor of Computational Fluid Mechanics, Department of Aeronautics, Imperial College London South Kensington Campus London SW7 2AZ s.sherwin@imperial.ac.uk +44 (0) 20 759 45052