|
[Sponsors] |
April 21, 2010, 17:40 |
CFD versus Structural Meshing
|
#1 |
Senior Member
Join Date: Feb 2010
Posts: 148
Rep Power: 17 |
Why does it take only a few minutes to mesh for a structural mesh and from several minutes up to hours to mesh for CFD? It seems that ANSYS uses the same meshing program regardless of the type of analysis?
Thank you for any help! |
|
June 8, 2010, 21:04 |
Physics based defaults.
|
#2 |
Senior Member
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47 |
Is this because the CFD mesh has a lot more elements?
In ANSYS Meshing, you tell it the physics (CFD, EMAG, FEA, Explicit) and it sets up your defaults to give a reasonable mesh. For instance, if you said FEA, it would know that you need a coarse mesh, probably quadratic Tets or Swept Hexa. If you chose EMAG, the tetras would have mid nodes, but would still be linear. If you chose CFD and you had "Program controlled inflation" on, it would know to give you a much finer mesh with linear tets or hexas, a sizing function to keep several cells across any gap and inflation (prisms or hexas) along walls (but not along Inlet, outlet or symmetry planes). In fact, it is smart enough to mesh differently if you tell it CFD-Fluent vs CFD-CFX, based on the specific needs of each solver. On a given model, the FEA default mesh could be only a few thousand elements, where as the mesher would insert millions of cells to resolve the same volume for CFD. Those extra elements with higher quality requirements take more time. Best regards, Simon |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Tetrahedral vs. Hexahedral Meshing for CFD | Andy Bartels | Main CFD Forum | 16 | September 20, 2019 11:06 |
CFD Design...The CFD Future | John C. Chien | Main CFD Forum | 20 | November 20, 2015 00:40 |
which software CFD is suitable for Civil & Structural Engineer | deust | Main CFD Forum | 1 | February 27, 2010 08:20 |
ASME CFD Symposium, Atlanta, July 2001 | Chris R. Kleijn | Main CFD Forum | 0 | August 21, 2000 05:49 |
Which is better to develop in-house CFD code or to buy a available CFD package. | Tareq Al-shaalan | Main CFD Forum | 10 | June 13, 1999 00:27 |