# SST turbulence with Gamma theta and Boussinesq model

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 June 10, 2013, 10:16 SST turbulence with Gamma theta and Boussinesq model #1 Senior Member   Govindaraju Join Date: Apr 2010 Posts: 207 Rep Power: 10 Sponsored Links Dear all I am doing heat transfer problem. The flow is horizontal ( Z direction) and pulsatile in nature. If I turned on the buoyancy option, what is happening in the heat transfer? ( I believe that cfx solver solves convection heat transfer) (Also please clarify in my case what shall I put the values in gravity x direction , y direction and z direction?( I am thinking to put z direction gravity =0 and I don't know y and x direction components? I am so confusing x directional gravity -9.8m/s^2 or y component gravity -9.8 m/s^2). If I turned off buoyancy, what is happening in the heat transfer? ( is it conduction heat transfer? )

 June 10, 2013, 22:17 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,721 Rep Power: 106 Yes, CFX solves convection heat transfer. Convection heat transfer is of two main forms: Natural convection where the flow is being driven by the density difference in the flow - you need gravity turned on to model this, and a fluid where density is a function of temperature (or a body force in proportion to temperature). Forced convection is where an externally driven flow causes heated fluid to be removed from a hot surface - you do not need gravity for this convection heat transfer.

June 11, 2013, 00:46
#3
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Govindaraju
Join Date: Apr 2010
Posts: 207
Rep Power: 10
Quote:
 Originally Posted by ghorrocks Yes, CFX solves convection heat transfer. Convection heat transfer is of two main forms: Natural convection where the flow is being driven by the density difference in the flow - you need gravity turned on to model this, and a fluid where density is a function of temperature (or a body force in proportion to temperature). Forced convection is where an externally driven flow causes heated fluid to be removed from a hot surface - you do not need gravity for this convection heat transfer.

Thank you so much

Is the CHT availbale in the tutorial convection heat transfer?

Thank you

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