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May 14, 2010, 03:17 |
Domain for external flow
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#1 |
New Member
Join Date: Aug 2009
Posts: 18
Rep Power: 17 |
I wish to raise some discussion points here on determining the best suitable type of domain shape for external flow. As we know, always there will be questions on "how large" or what should be the extend of domain size for external flow.
Typically there are a few approaches available: 1. to use a rectangular box with the size extended 5 to 10 times the characteristic length of the geometry/ object under simulation. 2. to use a sphere enveloping the object under simulation 3. to use a semi sphere The later two (2. and 3.) are said good to eliminate some edge effect at the corners of the domain which happens in 1. Does anyone has any experience with this method of modeling? Appreciate to receive some comments/ opinions/ advice from the fellow experts in CFDOnline. Thx & Cheers |
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May 14, 2010, 12:37 |
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#2 | |
Senior Member
Chris
Join Date: Jul 2009
Location: Ohio, USA
Posts: 169
Rep Power: 17 |
Quote:
external-topology.jpg I think blocking this way allows more control over the grid density. (I color-coded the edges to show what I mean. The edges with the same color would have the same grid density.) Also, it keeps the boundary layer grid from extending into the far field, reducing the total number of gridpoints. |
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August 8, 2010, 02:23 |
Domain for external flow
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#3 |
New Member
Ramakrishnan Ramaswamy
Join Date: Aug 2010
Location: Chennai
Posts: 1
Rep Power: 0 |
Hi friends, can anyone help me how to fix a domain for external flow. I am analysing flow over a swept wing. Can i choose a circular domain or rectangular one or oval shape, What is the significance one over the other?
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