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Showing results 1 to 10 of 10 Search took 0.00 seconds. Search: Posts Made By: dvolkind

Forum: CFX April 12, 2010, 13:08

Replies: 24 increased flowrate decreased in heat rejection? Views: 3,697 Posted By dvolkind No it's not a rotating fluid. Why do you ask? ... No it's not a rotating fluid. Why do you ask? By the way, I'll try to make your model work soon. Had no time since your last letter. You also asked about how you should estimate cooling...

Forum: CFX April 7, 2010, 23:34

Replies: 24 increased flowrate decreased in heat rejection? Views: 3,697 Posted By dvolkind Send me Your .def-file, I'll try to run it and... Send me Your .def-file, I'll try to run it and see what's wrong. dvolkind@hotmail.com

Forum: CFX April 7, 2010, 09:26

Replies: 24 increased flowrate decreased in heat rejection? Views: 3,697 Posted By dvolkind Bouyancy is not a boundary condition, it's a... Bouyancy is not a boundary condition, it's a fluid model option. By saying "Bouyancy does matter on the outer surface" I presumed that air domain surrounding the device is modelled. I also said that...

Forum: CFX April 7, 2010, 04:09

Replies: 24 increased flowrate decreased in heat rejection? Views: 3,697 Posted By dvolkind This time it's correct to apply heat flux to... This time it's correct to apply heat flux to determine water flow rate required. Heat flow has a choice now: it might be carried away with both water and air. Quote: "Does buoyancy modelling...

Forum: CFX April 6, 2010, 07:38

Replies: 24 increased flowrate decreased in heat rejection? Views: 3,697 Posted By dvolkind Quote: "Why use buoyancy model?" Because... Quote: "Why use buoyancy model?" Because it's a little easier than setting momentum source manually. "how should i model natural air convection please?" 1. Enable bouyancy, set bouancy...

Forum: CFX April 6, 2010, 06:29

Replies: 24 increased flowrate decreased in heat rejection? Views: 3,697 Posted By dvolkind Quote: "Is it enough to monitor H-Energy of fluid... Quote: "Is it enough to monitor H-Energy of fluid and T-Energy of solid domain imbalances please?" Yes, should be enough. Quote: "Heat source is the bottom volume of 3kW" Why do You model...

Forum: CFX April 4, 2010, 12:23

Replies: 24 increased flowrate decreased in heat rejection? Views: 3,697 Posted By dvolkind Quote: "i can't apply temperature BC, because i... Quote: "i can't apply temperature BC, because i want to find out the temperature at the surface with known heat loss (5kW) and fluid flowrate. ... I'm interested to know the heat taken away by the...

Forum: CFX April 4, 2010, 09:35

Replies: 24 increased flowrate decreased in heat rejection? Views: 3,697 Posted By dvolkind Quote: "Dmitry, I think mactech needs the CHT... Quote: "Dmitry, I think mactech needs the CHT domain for later work so the temperature boundary condition will not help." Why not? I guess he can still apply temperature BC to the outer surface...

Forum: CFX April 4, 2010, 04:21

Replies: 24 increased flowrate decreased in heat rejection? Views: 3,697 Posted By dvolkind Usually the default value is enough. You can set... Usually the default value is enough. You can set this value in Convergence criteria -> Conservation target (if You meant that) By saying temperature boundary condition I meant specifying wall...

Forum: CFX April 3, 2010, 11:27

Replies: 24 increased flowrate decreased in heat rejection? Views: 3,697 Posted By dvolkind Hello! If You wish to compare how much heat is... Hello! If You wish to compare how much heat is taken away at different flow rates, then I think You should better use temperature boundary condition. By specifying heat flux You predetermine the...

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