Hi
I'm trying to simulate the flow of water over an ogee spillway in Fluent. My problem is that I'm getting reversed flow on my pressure outlets. I am aware that it might not affect significantly my results but it slows down convergence, which is a problem for me. My settings are the following:
- Pressure-Based Solver
- Transient Simulation
- Gravity: 9.81 m/s2
- VOF Model with Open Channel Flow, Implicity Formulation and Implicity Body Force
- Phases: Water and Air
- K-omega SST turbulence model
- Inlet boundary: Velocity Inlet
- Outlet boundary: Pressure Outlet with Neibouring Cell Pressure Specification
- Atmospheric boundary: Pressure Outlet with gauge pressure = 0
- Operating Pressure = 0 at a point in the atmospheric boundary
At the beginning of the simulation the reversed flow is only on the atmospheric boundary and as the simulation progresses both atmospheric and outlet boundaries get reversed flow. How can I solve or minimize this problem?
https://www.sciencedirect.com/search?qs=Spillway%20Simulation%20in%20Fluent&show=25&sortBy=relevance
1) Check on the coordinates of your geometry. I observe there might be problem with g=9.81 value. If the x- axis is parallel to the horizontal level of water and y-axis is vertically upward direction, then you should assign gravity components as x = 0 and y =-9.81. If the y axis is vertically downwards, then your assignment of g =9.81 is correct. check once
2) assuming your x-axis is parallel to the top water level and towards opening for flow. In some areas in the flow field, U may observe circulation of flow particles towards x axis. this also leads to msg like reversed flow in fluent
I hope u understand the concept, any help in this welcome
check the coordinates and mesh of problem geometry.
this value (Gravity = - 9.81 m/s2) used if the flow is vertical
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