According to my video and web search, this is a common issue that many Fluent users face when simulating open channel flow with wave boundary conditions . Some possible causes and solutions are:
- The wave height may be affected by the mesh quality and resolution. You may need to refine your mesh near the free surface and use a finer time step to capture the wave dynamics more accurately .
- The wave height may also depend on the wave theory and spectrum that you choose for your boundary conditions. You may need to adjust the parameters such as wave length, wave period, wave amplitude, wave direction, etc. to match your desired wave characteristics .
- The wave height may be influenced by the numerical schemes and relaxation factors that you use for your solution methods. You may need to use a higher order scheme such as QUICK or MUSCL and lower the relaxation factors for pressure and volume fraction to improve the stability and accuracy of your solution .
You can find more details and examples on how to perform these steps in the following resources:
- A video tutorial on how to model a tank discharge flow using VOF model in Ansys Fluent .
- A video tutorial on how to model an open channel flow with wave using VOF model in Ansys Fluent 3.
- A forum thread on how to avoid incorrect wave height in Ansys Fluent.
- A forum thread on how to use wave period for input in Fluent.
- The Ansys Fluent User’s Guide, especially Chapter 23: Using the VOF Model.
- The Ansys Fluent Theory Guide, especially Chapter 18: Volume of Fluid Model Theory.
I hope this helps you avoid incorrect wave height in Ansys Fluent and achieve your desired simulation results. If you have any other questions, please feel free to ask me. 😊
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