The study is focused on pressure and velocity variation in u/s and d/s of a weir across river.
The weir is 14.6 m length from u/s to d/s and 9.0 m height. I have taken domain size of total length 414.6 m (300 m u/s, 14.6 m weir and 100 m d/s). The height of domain is 20 m. For boundary conditions, inlet is assigned as velocity inlet, outlet as pressure outlet and free surface as pressure outlet.
I am very new to ANSYS Fluent and kindly request to answer my question.
Please see the attached figure for reference.
Solve the problem step by step. Try to see first some meshing tutorials. I can recommend you some videos from our Lab. There are examples of the meshing and simulation of subsonic and supersonic flows, including the meshing techniques. https://youtube.com/c/ChemicalPropulsionLaboratoryUnB
There are many videos on YouTube about this topic.
Dear Kush,
Sorry it's a bit repetitive but here you can find some explanations:
What is a control volume independence study in a CFD analysis?
A control volume independence study consistsin making several CFD simulations with exactly the same conditions in all aspects but the dimensions of the control volume, to establish the most suitable
control volume for conducting the definitive simulations. Normally, in this study, the simulations are done with increasing size of the control volume and the evolution of the obtained numerical results is monitored (for example, we monitor how the lift and/or drag coefficients evolve with increasing size
of the control volume). At some point, the increase in accuracy of the results will be marginal and at expenses of a significant increase in computational time. In view of this, we choose the most suitable control volume as a trade‐off between the accuracy of results and the computational time.
What is a mesh independence study in a CFD analysis?
A mesh independence study consists in making several CFD simulations with exactly the same conditions in all aspects but the dimensions of the cells of the mesh and thus number of cells, to establish the most suitable mesh for conducting the definitive simulations. Normally, in this study, the
simulations are done with decreasing size of the cells (increasing number of cells) and the evolution of the obtained numerical results is monitored (for example, we monitor how the lift and/or drag coefficients evolve with increasing number of cells). At some point, the increase in accuracy of the results will be marginal and at expenses of a significant increase in computational time. In view of this, we choose the most suitable mesh as a trade‐off between the accuracy of results and the computational time.
What is a time step independence study in a CFD analysis?
When trying to numerically solve un‐steady or transient flow problems, a time step independence study consists in making several CFD simulations with exactly the same conditions in all aspects but the time step, to establish the most suitable time step for conducting the definitive simulations.
Normally, in this study, the simulations are done with different values of the time step and the evolution of the obtained numerical results is monitored (for example, we monitor how the lift and/or drag coefficients evolve with the value of the time step). At some point, the increase in accuracy of the results will be marginal and at expenses of a significant increase in computational time. In view of this, we choose the most suitable time step as a trade‐off between the accuracy of results and the computational time.
In a couple of minuts I will put a couple of links here to Bachelor's and Master's degrees these where these issues that trouble you are explained in-depth. Hope it is useful
Here in this link you can find the theses I was talking about in my previous response:
https://www.researchgate.net/post/What_should_be_the_design_of_turbine_blades_if_i_am_designing_a_turbine_to_produce_power_from_sea_waves
- Badges
- Science topic