Effective Strategy for ensuring convergence using FLuent's Fan Model
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If we switch on the fan model at the start so that it computes the Pressure Jump from a fan curve, it is found that the solution diverges after sometime and it predicts unreasonable mass flow-rates. Even limiting the max and min velocity range does not work. The solution is not to switch on the fan model at the start. - Run the case for some iterations to get reasonable convergence. - Determine the guess mass flow rate from the fan plane. - Calculate the pressure rise for this guessed flow rate from the fan curve. - Input this constant pressure rise in the Pressure-Jump option in fan model. - Run the case with this constant pressure rise for some iterations till we get reasonable mass flow rates (within limits). - Now switch on the the Polynomial option of Fan model to calculate the pressure rise from fan curve. - Run it till we get the reasonable convergence. |
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