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Showing results 1 to 21 of 21 Search took 0.00 seconds. Search: Posts Made By: ckleanth

Forum: CFX August 9, 2009, 08:02

Replies: 60 Combustion model - Fluid Material Views: 14,956 Posted By ckleanth george, to be honest i think you are trying to do... george, to be honest i think you are trying to do more than what you can achieve with your timeframe. your questions lack the fundamental understanding of what you do and I (or anyone else in this...

Forum: CFX August 9, 2009, 07:04

Replies: 60 Combustion model - Fluid Material Views: 14,956 Posted By ckleanth I think this is better to be answered here so... I think this is better to be answered here so others will read and benefit. if you will use one inlet boundary to specify the air/fuel ratio you will need to link the inlet mass fractions with...

Forum: CFX August 9, 2009, 05:10

Replies: 60 Combustion model - Fluid Material Views: 14,956 Posted By ckleanth well at the inlet you spesified the mixture to be... well at the inlet you spesified the mixture to be ch4 = 1 co2 = 0 h20 = 0 o2 = 0.232 n2 = constrant = (1 - all the above) you cant have a mixture that adds up to more than 1; you need to...

Forum: CFX August 8, 2009, 11:50

Replies: 60 Combustion model - Fluid Material Views: 14,956 Posted By ckleanth in v11 cfxmesh can do only tetra witout... in v11 cfxmesh can do only tetra witout periodicity; how did you manage to create a sweep or hexa mesh :confused: since the files you send me the other day did you create a new model with symetry?

Forum: CFX August 8, 2009, 07:33

Replies: 60 Combustion model - Fluid Material Views: 14,956 Posted By ckleanth slow the mesh movement compared to the timestep... slow the mesh movement compared to the timestep used and check the mesh quality during squashing. as i told you stop simulation, re-mesh and restart.

Forum: CFX August 5, 2009, 09:42

Replies: 60 Combustion model - Fluid Material Views: 14,956 Posted By ckleanth for expert parameters dont change things unless... for expert parameters dont change things unless you know what they are doing. you want coupling of scalars get rid of that option for transient initialisation override if you use a global...

Forum: CFX August 5, 2009, 08:44

Replies: 60 Combustion model - Fluid Material Views: 14,956 Posted By ckleanth EXPERT PARAMETERS: coupled scalars = f ... EXPERT PARAMETERS: coupled scalars = f why? ggi permit no intersection = t include pref in forces = t min timesteps = 1 model coefficient relaxation = 1.0 ...

Forum: CFX August 4, 2009, 18:15

Replies: 60 Combustion model - Fluid Material Views: 14,956 Posted By ckleanth post your ccl post your ccl

Forum: CFX August 4, 2009, 03:03

Replies: 60 Combustion model - Fluid Material Views: 14,956 Posted By ckleanth besides that you need to assume a mixture of fuel... besides that you need to assume a mixture of fuel and air (not that difficult thing to do really - not sure why you ask how to do it) I think you are loosing a lot of flow information and bring a lot...

Forum: CFX July 31, 2009, 04:34

Replies: 60 Combustion model - Fluid Material Views: 14,956 Posted By ckleanth I have only values for argon and electric... I have only values for argon and electric conductivity [S/m] which is 1/resistivity [1/ ohm/m] forget about CFX-RIF, just put a value to start the combustion maybe a small 2d test model can help...

Forum: CFX July 30, 2009, 21:30

Replies: 60 Combustion model - Fluid Material Views: 14,956 Posted By ckleanth the activation energy is used in the Arrhenius... the activation energy is used in the Arrhenius rates so either you should have all kinetics and rates in advance to setup your reaction or as in this case you can easily look at the activation energy...

Forum: CFX July 28, 2009, 21:33

Replies: 60 Combustion model - Fluid Material Views: 14,956 Posted By ckleanth Source = EnergySource Source Coefficient =... Source = EnergySource Source Coefficient = -EnergySourceCoefficient EnergySourceCoefficient = (watt/sphere volume) [W/(m^3 K)] *SphereDispersion * step((5000. [K] - T)/1. [K]) EnergySource =...

Forum: CFX July 27, 2009, 07:17

Replies: 60 Combustion model - Fluid Material Views: 14,956 Posted By ckleanth the source point allocates the spesifed energy in... the source point allocates the spesifed energy in one volumetric element, where as if you use a volumetric energy source to represent ignition spark you need to define by ccl an assumed sphere volume...

Forum: CFX July 26, 2009, 22:00

Replies: 60 Combustion model - Fluid Material Views: 14,956 Posted By ckleanth george, I have not used the flamelet libraries in... george, I have not used the flamelet libraries in my simulations therefore I cannot comment more than what I believe is accurate. without having the model in front of me, and not knowing what the...

Forum: CFX July 26, 2009, 19:20

Replies: 60 Combustion model - Fluid Material Views: 14,956 Posted By ckleanth referring to the burning velocity model have a... referring to the burning velocity model have a look in the cfx manual in solver theory section. when ansys refers to premixed combustion they mean that the global reaction process (fuel + oxidizer->...

Forum: CFX July 24, 2009, 08:17

Replies: 60 Combustion model - Fluid Material Views: 14,956 Posted By ckleanth I as I said I would simply use a volumetric... I as I said I would simply use a volumetric energy source to represent ignition spark as a function of crankangle, not sure about the cluster question

Forum: CFX July 23, 2009, 02:59

Replies: 60 Combustion model - Fluid Material Views: 14,956 Posted By ckleanth I hope you have one more month for modeling and... I hope you have one more month for modeling and not writing up in this instance forget isoctane, do methane or butane combustion - these reaction rates are already available in the library, if...

Forum: CFX July 22, 2009, 21:05

Replies: 60 Combustion model - Fluid Material Views: 14,956 Posted By ckleanth do check the part in the manual which discusses... do check the part in the manual which discusses which combustion model is more appropriate in solver modeling guide>combustion modeling> using combustion models in this instance I'd think that...

Forum: CFX July 22, 2009, 20:42

Replies: 60 Combustion model - Fluid Material Views: 14,956 Posted By ckleanth can you say that you can trust the mathematical... can you say that you can trust the mathematical model 100% how can you tell its more accurate than the CFD model? do you have experimental data for cross checking? swirl in the chamber and the...

Forum: CFX July 22, 2009, 19:54

Replies: 60 Combustion model - Fluid Material Views: 14,956 Posted By ckleanth glenn might be a better person to ask for his... glenn might be a better person to ask for his opinion to be honest; I only performed 1D engine models as a part for my phd. my concern is how it is possible to do a thesis without a supervisor that...

Forum: CFX July 22, 2009, 18:21

Replies: 60 Combustion model - Fluid Material Views: 14,956 Posted By ckleanth for engine simulations without coupling external... for engine simulations without coupling external kinetic code (for example chemkin) you will need to use reduced species but well defined fuel mixture for example isoctane and the chemistry involved...

Showing results 1 to 21 of 21

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