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Showing results 1 to 6 of 6 Search took 0.00 seconds. Search: Posts Made By: ghorrocks

Forum: CFX November 4, 2013, 04:25

Replies: 11 A wall has been placed at outlet Views: 3,576 Posted By ghorrocks True. And I suspect in LES adaptive timestepping... True. And I suspect in LES adaptive timestepping will constant jiggle the time step up and down with the turbulent fluctuations and that is not a good thing either.

Forum: CFX November 3, 2013, 16:39

Replies: 11 A wall has been placed at outlet Views: 3,576 Posted By ghorrocks Courant Number has only a low relevance to CFX as... Courant Number has only a low relevance to CFX as it is an implicit solver. You are getting mixed up with explicit solvers where Courant number is critical. Just because Courant number <1 that does...

Forum: CFX November 3, 2013, 05:03

Replies: 11 A wall has been placed at outlet Views: 3,576 Posted By ghorrocks Adding imbalances to the convergence criteria... Adding imbalances to the convergence criteria just means you are converging tighter. If this changes the result then your previous convergence tolerance was too loose. You really need to do...

Forum: CFX October 30, 2013, 16:44

Replies: 11 A wall has been placed at outlet Views: 3,576 Posted By ghorrocks If you are doing LES then a finer mesh and time... If you are doing LES then a finer mesh and time steps will resolve more turbulent eddies and you should get more backflow. This is not surprising. But if you are doing LES then the choice of mesh...

Forum: CFX October 30, 2013, 05:03

Replies: 11 A wall has been placed at outlet Views: 3,576 Posted By ghorrocks The trick of extending the outlet downstream does... The trick of extending the outlet downstream does not work so well for LES. In LES you have turbulent eddies which will have parts where the flow is going backwards. This means you will almost...

Forum: CFX October 28, 2013, 16:37

Replies: 11 A wall has been placed at outlet Views: 3,576 Posted By ghorrocks This is an FAQ:... This is an FAQ: http://www.cfd-online.com/Wiki/Ansys_FAQ#During_the_solution_process.2C_I_get_the_warning_message_.22A_wall_has_been_placed_at_portion.28s.29_of_an_OUTLET.22 If it does not seem to...

Showing results 1 to 6 of 6

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