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Forum: CFX

March 8, 2014, 04:33

Replies: 13

Overflow in hypersonic flow simulation

Views: 2,908

Posted By ghorrocks

FAQ:...

FAQ: http://www.cfd-online.com/Wiki/Ansys_FAQ#I_get_the_error_.22Floating_point_exception:_Overflow.22._What_does_this_mean_and_what_do_I_do_about_it.3F

But you shoudl expect numerical instability...

Forum: CFX

February 26, 2014, 19:42

Replies: 13

Overflow in hypersonic flow simulation

Views: 2,908

Posted By ghorrocks

Comments like that make me smile. Did you do a...

Comments like that make me smile. Did you do a sensitivity check against an accuracy tolerance you are happy with? Or did you just look at it and it looks kinda fine? The first is useful, the second...

Forum: CFX

February 26, 2014, 16:45

Replies: 13

Overflow in hypersonic flow simulation

Views: 2,908

Posted By ghorrocks

Another trick to try for supersonic flow is to...

Another trick to try for supersonic flow is to use Local Time Stepping, set to about 5.0. This can be useful. But make sure you change back to physical time stepping for the final run to convergence...

Forum: CFX

February 22, 2014, 04:34

Replies: 13

Overflow in hypersonic flow simulation

Views: 2,908

Posted By ghorrocks

No need for the images just yet. This is a FAQ,...

No need for the images just yet. This is a FAQ, but I have not written the FAQ for it yet.

You need to improve the numerical stability. The answer (as I just posted on another thread), is improve...

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