I am currently modelling convection in a solar still (2D steady state problem). Where the water surface temperature and glass cover temperature are constant. The properties of water vapor are fed and reference values provided. Using a SIMPLEC scheme and Initializing the problem the solution is obtained. However, initializing the solution procedure from water temperature yields a different result as from initialization from glass temperature.
Also the values of Nusselt number obtained are usually absurd
Can someone guide me on the initialization of such a problem in Fluent. I also want comments on Nusselt number evaluation in fluent
Yes, Energy as well as Species (Thermal Diffusion) is turned "on"
Temperature and concentrations on water surface(bottom) and glass surface(top) are provided. The other two surfaces forming the trapezoidal cavity are insulated (q=0)
Solution is converged when the residuals are 0.001 for continuity, x-velocity and y-velocity, however, for energy equation a residual of 0.000001 is set.
Yes, the solution converges
Dear Sir,
As you used the properties of water vapor and you try to get start of solution, so that it depends on the type of your regime:
If you have laminar fluid flow, the best initialize is the standard one as it will ask you the section of the initialize and normally select the inlet section as it have the enough variable information like the velocity inlet and the temperature.
But if you have turbulent fluid flow I advice you to select the second option which start to estimable at lest 10 levels of te solution.
Best regards
Greetings,
I suggest that you can select (all zones) option for models like this one, where there is no starting point for flow. We have made simulation previously for a solar absorption unit and initialization method was all zones.
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