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Showing results 1 to 9 of 9 Search took 0.00 seconds. Search: Posts Made By: ghorrocks

Forum: CFX March 12, 2013, 17:05

Replies: 21 find choking range in orifice Views: 3,902 Posted By ghorrocks It means there is some fast moving flow in your... It means there is some fast moving flow in your simulation. Unless you give some context for that question we cannot help you.

Forum: CFX March 12, 2013, 06:28

Replies: 21 find choking range in orifice Views: 3,902 Posted By ghorrocks Increase the pressure ratio. If the flow rate... Increase the pressure ratio. If the flow rate does not change it is choked.

Forum: CFX March 12, 2013, 06:04

Replies: 21 find choking range in orifice Views: 3,902 Posted By ghorrocks I presume this simulation is axisymmetric? You... I presume this simulation is axisymmetric? You should model a thin wedge in that case. Shame CFX does not have a true 2D model like Fluent, that would be very useful for this case. You may need to...

Forum: CFX March 11, 2013, 16:42

Replies: 21 find choking range in orifice Views: 3,902 Posted By ghorrocks Local time scale factors of 5 are the range you... Local time scale factors of 5 are the range you normally use. If you are using 0.01 with Mach 400 somehwere then soemthing is seriously wrong with your setup. If you have a transonic simulation...

Forum: CFX March 10, 2013, 06:29

Replies: 21 find choking range in orifice Views: 3,902 Posted By ghorrocks CFX3 and 4 used SIMPLEC as a default solver. CFX5... CFX3 and 4 used SIMPLEC as a default solver. CFX5 (which is the first in the current series of solvers) used the fundamental solver technology developed in TASCFlow (ie coupled solver). CFX has had...

Forum: CFX March 9, 2013, 01:34

Replies: 21 find choking range in orifice Views: 3,902 Posted By ghorrocks * CFX is a coupled solver and does not use... * CFX is a coupled solver and does not use SIMPLE. Your analysis is based around a SIMPLE solver. * CFX uses a multigrid solver which achieves rapid convergance (most of the time :) ) even on fine...

Forum: CFX March 7, 2013, 17:03

Replies: 21 find choking range in orifice Views: 3,902 Posted By ghorrocks Yes, I frequently use local time scale for tricky... Yes, I frequently use local time scale for tricky to converge simulations, especially transonic ones. Your understanding of local time scale does not seem correct - local time scale simply uses a...

Forum: CFX March 6, 2013, 17:37

Replies: 21 find choking range in orifice Views: 3,902 Posted By ghorrocks The best boundary condition for this type of... The best boundary condition for this type of simulation is a total pressure inlet and a pressure outlet. But convergence of these type of simulations is tricky, use a bit of local tiem scale factor...

Forum: CFX March 5, 2013, 18:57

Replies: 21 find choking range in orifice Views: 3,902 Posted By ghorrocks You should be able to estimate the choking... You should be able to estimate the choking pressure using simple compressible flow analytical equations.

Showing results 1 to 9 of 9

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