If “Solve Momentum” is disabled in the Eulerian Wall Film model, is the film velocity still evaluated as non-zero?
June 6, 2022 at 8:33 amFAQParticipant
When the “Solve Momentum” is enabled in the Eulerian Wall Film model, the average film velocity is obtained by solving a momentum conservation equation for the film. If the “Solve Momentum” is disabled, the film velocity is evaluated based on two driving forces for the film flow, namely
1. Shear due to external flow: A linear velocity profile is assumed within the film thickness, from wall to air-film interface and zero-jump condition of shear stress is applied to evaluate the film velocity.
2. Gravity force: A parabolic profile is assumed within the film thickness from wall to the air-film interface and the gravity forces is balanced with the wall shear force.
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