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The PRESTO! pressure interpolation scheme, when used with the non-iterative time-advancement solver, is less stable than in the case of the iterative time-advancement solver. As a consequence, smaller time steps may be required. Therefore, if you are using the NITA, please use smaller time step size when facing stability issues or select a pressure interpolation method other than PRESTO! For further details, please refer to the documentation in the ANSYS Fluent Users Guide  Using the Solver  Pressure-Based Solver Settings  Setting Solution Controls for the Non-Iterative Solver

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