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Showing results 1 to 5 of 5 Search took 0.00 seconds. Search: Posts Made By: brunoc

Forum: CFX October 13, 2013, 14:57

Replies: 10 Natural convection on a PCB's heat sink (with CFX) Views: 4,741 Posted By brunoc Is a density of 1 representative of the average... Is a density of 1 representative of the average density inside your domain? If it's not, change it to a value that is. As for the thermal expansibility, it will be 1/T_ref (in K). Your results...

Forum: CFX September 2, 2013, 17:23

Replies: 10 Natural convection on a PCB's heat sink (with CFX) Views: 4,741 Posted By brunoc If your working fluid is air, just use a constant... If your working fluid is air, just use a constant density.

Forum: CFX September 2, 2013, 17:14

Replies: 10 Natural convection on a PCB's heat sink (with CFX) Views: 4,741 Posted By brunoc If you use 'Air at 25 C', make sure you change... If you use 'Air at 25 C', make sure you change its properties (at least density and thermal expansivity) to reflect those from the average temperature you are expecting in your domain.

Forum: CFX September 2, 2013, 16:58

Replies: 10 Natural convection on a PCB's heat sink (with CFX) Views: 4,741 Posted By brunoc No, when you use 'Air Ideal Gas' as fluid you... No, when you use 'Air Ideal Gas' as fluid you automatically activate the full buoyancy model (ie, not Boussinesq). There is no toggle for the Boussinesq approximation; it is activated when you select...

Forum: CFX September 2, 2013, 14:18

Replies: 10 Natural convection on a PCB's heat sink (with CFX) Views: 4,741 Posted By brunoc Have you tried the natural convection tutorial... Have you tried the natural convection tutorial that comes with CFX as base start for your own model? If you haven't, do that first, as it will help you with some specifics to modeling natural...

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