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[Solution]

When using the “fixed values” option for a cell zone in Fluent, velocity will usually remain fixed, but will diverge in some cases. By giving a momentum source, you can achieve a more stable calculation. The procedure is explained below: 1. Separate the cell zone you want to fix the velocity either in meshing or in Fluent 2. In Fluent, click DefineCell Zone Conditions and edit the require cell zone. Set Source TermsX Momentum (x-if you want to fix the x-velocity) Use the following formula: M = U · U · S · ρ / V U = Velocity you want to fix S = The cross-sectional area of the cell zone (m^2) ρ = Density of the fluid (kg/m^3) V = Volume of the cell zone (m^3) M = Momentum source (N/M^3)

Attachments:
1. 2042074.pdf