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Fluent + flow past cylinder at Re=40

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Old   April 12, 2013, 04:49
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Mitesh Vegad
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I am extending study of flow over circular cylinder for Re=40, considering heat transfer along with fluid flow.

I am solving non dimensional form of steady, 2-D energy equation with constant fluid property and no heat generation, along with the mass and momentum conservation in 2-D

The boundary condition that i have specified is:

Cylinder: Wall at constant temperature at value of 1.0
Inlet: Constant velocity at constant temperature at value of 0.0
exit: outlet
Top and bottom horizontal surface: wall, adiabatic

I have not switched on the gravity.... (am no considering natural convection)

The trouble is that when i run the simulation .... it gives a message:

Value of temperature limited to 1.0 in the fluid zone!!!
The residual curve for energy equation is flat!


Can someone help what this is??
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Old   April 13, 2013, 05:50
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Sijal Ahmed Memon (turboenginner@gmail.com)
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Do you have some particular experimental setup in your mind? How do you specify boundary conditions and what parameters you are trying to match?
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Old   April 14, 2013, 16:12
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I am actually trying to ultimately solve flow of fluid around a heated cylinder...

The problem is that when i try and simulate for non dimensional equations using Fluent for the following parameters:

Pr=5.6, Re=10, Gr=0

there is problem when i initialize the solution...the message that i get is...

Temperature limited to 1.0 in fluid zone!!!

However when i use the DIMENSIONAL values of density, viscosity, specific heat and thermal conductivity along with the diameter value and input velocity (for Re=10) then i get the solution!!

Can you help and tell where the problem is???
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Old   April 18, 2013, 06:42
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any update?
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Old   April 21, 2013, 23:38
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Actually when i am solving for NON DIMENSIONAL form of governing equation.... the way i have defined non dim temperature... the value is ZERO at the inlet....

Fluent has something that they call as FLOOR and CEILING values set for the parameter... its there in SOLVE menu....

One has to set the FLOOR value to zero.... (DEFAULT is one)... then things work out.
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