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August 21, 2016, 14:15 |
The Navier stokes equations
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#1 |
New Member
Maryam Mirza
Join Date: Aug 2016
Posts: 12
Rep Power: 10 |
Hi!
I am new here and in the world of CFD i have questions please 1- why we use often the vorticity-velocity formulation than the primitive one (in 2D) 2-I read that the uwpind sheme is more accurate for solving the primitive formulation of NSeqs. why? thank you Best regards |
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August 22, 2016, 04:18 |
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#2 | |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,849
Rep Power: 73 |
Quote:
1) Actually, I don't see such formulation very often...the stream function-vorticity is often used for 2d, laminar flow because you solve only 1 parabolic equation and the elliptic equation for the stream function has boundary conditions that make faster the convergence than the pressure equation. 2) Your statement is not correct. Accuracy depends on the type of the discretization and is not related to upwinding. |
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August 22, 2016, 08:27 |
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#3 |
New Member
Maryam Mirza
Join Date: Aug 2016
Posts: 12
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1- yes i wanted to say stream-vorticity, thank you.
2- the same when we have a big Re (the convection term dominated)?? |
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August 24, 2016, 13:04 |
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#4 |
New Member
Maryam Mirza
Join Date: Aug 2016
Posts: 12
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any help please?
also could you give me some books or paper to read for beginners? thank you best regards |
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August 24, 2016, 14:31 |
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#5 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
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you can find the main titles in this forum, for example the book of Peric & Ferziger
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August 25, 2016, 00:57 |
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#6 |
New Member
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Introduction to Computational Fluid Dynamics by John Anderson is a classic beginner's text book.
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August 30, 2016, 22:21 |
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#7 |
Senior Member
david
Join Date: Oct 2012
Posts: 142
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To clear your doubts pertaining to the upwind scheme, try looking up the peclet number.
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