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Confusion about non-dimensionalization and Reynolds no. |
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June 20, 2011, 10:40 |
Confusion about non-dimensionalization and Reynolds no.
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#1 |
Senior Member
TWB
Join Date: Mar 2009
Posts: 400
Rep Power: 19 |
Hi,
I am confused about non-dimensionalization and Reynolds no. I have a numerical NS solver which uses the non-dimensional NS equation to solve. I can specify the Re and u_inf values. Supposed I want to solve the flow past a cylinder. I let Re = 40, u_inf = 1. I get a steady solution of cd=1.6 If I now change u_inf to 2, my cd becomes around 5. However, Re is still 40. I thought that if my Re remains the same, I should get the same ans... Did I miss out something? Or is there something wrong with my solver? Hope someone can help! |
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June 20, 2011, 15:26 |
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#2 |
Senior Member
Morteza
Join Date: May 2010
Location: Iran,Islamic Republic of
Posts: 161
Rep Power: 15 |
respected friend
I think you are trying to slove a problem that you have not the sufficient knowledge about that. Non-dimensionalization is one the fundamental course matters in fluid mechanics... Take a look at some fluid mechanics to get more familiar with this matter. Explain more about the code... I can help you........ |
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June 20, 2011, 18:11 |
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#3 |
Senior Member
TWB
Join Date: Mar 2009
Posts: 400
Rep Power: 19 |
Hi, I think there's something wrong with my numerical solver.
I tried to run the same case in Fluent. As long as the calculated Re=40, my result will be the same. I can double the velocity from 1 to 2. In that case, to get the same Re, I can maybe half the density. The ans for both will be the same. |
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