Cascade CFD Simulation Training by Ansys Fluent
Price: $16
In this project, a cascade with an interrupted water inlet has been simulated and the results of this simulation have been investigated.
Cascade CFD Simulation Training by Ansys Fluent
Price: $16
In this project, a cascade with an interrupted water inlet has been simulated and the results of this simulation have been investigated.
Cascade Project Description
The goal of this project is to simulate a cascade with an interrupted water inlet by ANSYS Fluent software. The Eulerian multiphase model has been used. The water is entering the domain with a speed of 0.3 m/s with gravity considered as -9.81 m/s-2 on the y-axis.
Geometry & Mesh
The 2-D geometry of the present model is carried out using Design Modeler software. The geometry consists two-section, the lower section is resident water, and the upper section contains outlet and velocity inlet; tank sides are considered as well.
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The meshing of this present model has been generated by Ansys Meshing software. The mesh grid is unstructured with no element quality lower than 0.53, and the total cell number is 110976.
Cascade CFD Simulation
To simulate the present model, several assumptions are considered, which are:
- The solver is pressure-based and transient.
- Simulation has only examined fluid behavior; in other words, heat transfer simulation has not been performed.
- The effect of gravity on the flow is considered to be 9.81 m.s-2 and along with the y-axis in the present model.
The following is a summary of the steps for defining the problem and its solution
| Models | ||
| K-omega | Viscous model | |
| SST | k-omega model | |
| shear flow corrections | k-omega options | |
| air | primary phase | |
| water | secondary phase | |
| explicit | formulation | |
| Boundary conditions | ||
| Velocity-inlet | Inlet | |
| 0 | initial gauge pressure | Mixture |
| 0.3 m/s | velocity magnitude | Water |
| 1 | volume fraction | |
| Pressure outlet | outlet | |
| 1 | backflow volume fraction | Air |
| 0 | backflow volume fraction | Water |
| wall | Wall | |
| stationary wall | wall motion | |
| Solution Methods | ||
| Phase coupled | pressure-velocity coupling | |
| PRESTO! | pressure | |
| first-order upwind | momentum | |
| first-order upwind | specific dissipation rate | |
| first-order upwind | volume fraction | |
| Initialization | ||
| standard | initialization method | |
| 0.3 m/s | water velocity (0,y,0) | |
| 0 m/s | air velocity (x,y,z) | |
| 1 | the secondary phase volume fraction | |
Cascade Results
At the end of the solution process, two-dimensional and three-dimensional velocity, air and water volume fraction, and animation are obtained. This 2-D simulation shows water starts to fall cascade for 0.75 seconds. Then velocity cuts off to 0 m/s for 0.75 and continues with 0.3 m/s for another 0.75 seconds. This process repeats over and over again.