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cfdcoder October 31, 2012 03:25

flat plate simulation using compressible solver
I am verifying my compressible solver for laminar flow over flat plate by using Blasius solution. The Reynolds number in such cases is given per length e.g. 5000/metre. My question is - Should I change the value of Reynolds number in my code at every value of X - cordinate over the plate OR should I take the total length of plate I am using as the reference and use the corresponding Reynolds number.

Also in this case should the viscosity be taken as constant or should it be allowed to vary as f(Temperature).

praveen October 31, 2012 10:03

It is usually Re based on plate length. The temperature dependance of viscosity is very weak at normal temperatures. So you could use some average temperature that you expect in the solution to compute viscosity used in definition of Re.

cfdcoder November 2, 2012 06:32

So if Reynolds number is given as 5000/ metre and I have 2mtr plate then I take Reynolds number constant as 10000 over all the domain. Am I correct here?

I would not be aware of temperature apriori. How can I take average temperature?

praveen November 2, 2012 11:39

You must know what Re you want at the end of the plate. Then choose other values to achieve that.

You can use the inflow conditions of temperature, density, etc. to determine Re.

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