Cascade CFD Simulation Training by Ansys Fluent
In this project, a cascade with an interrupted water inlet has been simulated and the results of this simulation have been investigated.
This product includes Geometry & Mesh file and a comprehensive Training Movie.
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Cascade Project Description
The goal of this project is to simulate a cascade with an interrupted water inlet. The Eulerian VOF model has been used. The water is entering the domain with the 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 considering as well.
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.
- 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
|shear flow corrections||k-omega options|
|0||initial gauge pressure||Mixture|
|0.3 m/s||velocity magnitude||Water|
|1||backflow volume fraction||Air|
|0||backflow volume fraction||Water|
|stationary wall||wall motion|
|Phase coupled||pressure-velocity coupling|
|first-order upwind||specific dissipation rate|
|first-order upwind||volume fraction|
|0.3 m/s||water velocity (0,y,0)|
|0 m/s||air velocity (x,y,z)|
|1||the secondary phase volume fraction|
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.
You can obtain Geometry & Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.