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Cascade CFD Simulation Training by Ansys Fluent

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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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Description

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.

cCascade

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

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

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.

You can obtain Geometry & Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.

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