Temperature variations with increasing number of iterations
Hope you are doing good.
I am actually simulating a program in FLUENT with the following settings:
Turbulent Intensity: 4.5
Hydraulic Diameter: 25.3371
293K [water] 300K [vapour]
Mapped Free Meshing
RPI Boiling Model
Viscous Model k-epsilon
Enhanced Wall Treatment
Drag Coefficient: boiling-ishii
Surface Tension: 0.06
Interfacial Area: ia-particle
Flow Courant Number: 10
Turbulent Kinetic Energy:0.8
Turbulent Dissipation Rate: 0.8
When I run the simulation for around 300 iterations, the residuals become flat and there are no fluctuations. The output obtained is as desired (temperature, pressure, velocity of water, velocity of vapour). But when I increase the number of iterations, say like, to 1000 then the temperature profile changes drastically keeping the remaining (pressure, velocity of water, velocity of vapour) same as before.
Could anyone please help me in knowing what I am doing wrong???
Thanks a lot in advance.
Have you reached convergence (i.e. have your residuals gone below the convergence criteria)?
Thanks Meangreen for the prompt reply!!!
Earlier I had set my residuals criteria to 1e-6 then it was not converging as most of the parameters became flat after 1e-4. So, when I set my residual criteria to 1e-3 then it converged. I am attaching the snapshots of the plot when I had set number of iterations to 1000.
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