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Showing results 1 to 14 of 14 Search took 0.00 seconds. Search: Posts Made By: Far

Forum: CFX November 1, 2016, 12:49

Replies: 38 Axial compressor calculation steps? Views: 8,587 Posted By Far yes. It will just the conditions in the solver... yes. It will just the conditions in the solver file not in pre file

Forum: CFX November 16, 2011, 11:52

Replies: 38 Axial compressor calculation steps? Views: 8,587 Posted By Far For blade and nozzle (Nozzle = stator, We should... For blade and nozzle (Nozzle = stator, We should rather use the compressor terminology as opposed to turbine terminology) use the standard conditions on walls i.e. no slip.

Forum: CFX November 16, 2011, 11:12

Replies: 38 Axial compressor calculation steps? Views: 8,587 Posted By Far For inlet domain (which is not important for your... For inlet domain (which is not important for your simulation, it has only function to ease the solution right?) use coarse mesh and specify hub and casing as inviscid wall (wall with zero shear or...

Forum: CFX November 16, 2011, 10:46

Replies: 38 Axial compressor calculation steps? Views: 8,587 Posted By Far This is known as numerical stall and may occur... This is known as numerical stall and may occur before actual stall due to numerical solution instability.

Forum: CFX November 16, 2011, 10:43

Replies: 38 Axial compressor calculation steps? Views: 8,587 Posted By Far sent two papers on hybrid wall functions 1)... sent two papers on hybrid wall functions 1) Knopp (DLR) 2006 J.Computational Physics 2) Kalitzin (Stanford University, Turbulence Research Centre) 2005 J. Computational Physics

Forum: CFX November 16, 2011, 10:34

Replies: 38 Axial compressor calculation steps? Views: 8,587 Posted By Far You can run fresh case with fine mesh. No need... You can run fresh case with fine mesh. No need for initial conditions. Initial guess is necessary when convergence is very difficult like for differential Reynolds stress turbulence models or flows...

Forum: CFX November 16, 2011, 10:05

Replies: 38 Axial compressor calculation steps? Views: 8,587 Posted By Far well, the SST model in better in performance but... well, the SST model in better in performance but it tends to over predict the separation zone and therefore likely to have numerical stall at lower pressure ratio than in real. second problem is that...

Forum: CFX November 16, 2011, 07:16

Replies: 38 Axial compressor calculation steps? Views: 8,587 Posted By Far Use K-epsilon (also use lower pressure at outlet... Use K-epsilon (also use lower pressure at outlet as discussed earlier)

Forum: CFX November 15, 2011, 23:32

Replies: 38 Axial compressor calculation steps? Views: 8,587 Posted By Far This should also be noted as the no. of nodes... This should also be noted as the no. of nodes increases compressor simulation tend to numerically stall at the higher pressure ratio than for coarse mesh. Therefore it is good idea to refine mesh...

Forum: CFX November 15, 2011, 07:34

Replies: 38 Axial compressor calculation steps? Views: 8,587 Posted By Far Could you please post some pics of your domain... Could you please post some pics of your domain and mesh. Also post information about total no of nodes in domain, any information about the interface between rotor and stator. Any how, compressor...

Forum: CFX November 14, 2011, 08:19

Replies: 38 Axial compressor calculation steps? Views: 8,587 Posted By Far Simple. Just use 101325 pa as inlet pressure (or... Simple. Just use 101325 pa as inlet pressure (or profile at later stages) and outlet pressure 101325, then gradually increase static pressure at outlet to 105000 110000 115000 120000 122500...

Forum: CFX November 14, 2011, 08:08

Replies: 38 Axial compressor calculation steps? Views: 8,587 Posted By Far are you using rotor or complete stage. If rotor... are you using rotor or complete stage. If rotor then 138 KPa is very high value, beyond the stall point!! Even with stator case, it is still too high value, have start with 101325 Pa and gradually...

Forum: CFX November 14, 2011, 07:49

Replies: 38 Axial compressor calculation steps? Views: 8,587 Posted By Far whats inlet and outlet pressure? and flow... whats inlet and outlet pressure? and flow direction (-1 axial, 0 for other directions)?

Forum: CFX November 14, 2011, 07:43

Replies: 38 Axial compressor calculation steps? Views: 8,587 Posted By Far rpm is 17188.7 or -17188.7? rpm is 17188.7 or -17188.7?

Showing results 1 to 14 of 14

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