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August 30, 2004, 04:35 |
Turbulent Natural Convection
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#1 |
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Hi, Iam trying to simulate turbulent natural convection in a square cavity using Fluent 6.0 the problem specifications are:
1.Square aluminium cavity of area 1 m2 with top and bottom walls being adiabatic, Hot wall temp=320 k,Cold wall temp=300 K. 2.Properties of Air(Boussinesq assumption) being taken as density=1.177,Cp=1007,Viscosity=1.857e-5,K=0.02653,Co-eff of thermal expansion=0.018,dT=20 K,g=9.81 values are chosen such that Ra for the flow is 1e10. 3.Turbulence model:K-E standard,with enhanced wall treatment and full buoyancy effects.Defaults for all model constants. 4.Mesh size=200x200,double sided with ratios=1.02 5.Solver : 2ddp,steady,with default under relaxation parameters. Under these settings the maximum Surface Nusselt number for the cold wall was obtained as -80.355 while the experimental value was -138,can anyone suggest reason for deviation ? Please suggest if the problem has been set up properly in Fluent and alternative formulations Thanks, Hemanth |
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