Water Discharge of a Rotating Tank, Ansys Fluent CFD Simulation Training

$80.00 Student Discount

In this project, the water discharging of a rotating tank has been simulated, and the results have been investigated.

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Water Discharge Project Description

In this project, Ansys Fluent software has been used to simulate the water discharge of a rotating tank. The Volume of  Fluid (VOF) model has been used to simulate and solve the two-phase flow field equations. The primary phase is air and, the secondary phase is water. The tank rotates about the Y-Axis at a speed of 80 rev/min. In the bottom of the tank, there are two circular orifices that water discharges from them.

Geometry & Mesh

The geometry of the present model is generated using Design Modeler software. The tank is a cylinder with a diameter of 1 m and a height of 0.75m, and the orifice diameter is 150 mm.

Water Discharge

The meshing of the present model has been done using ANSYS Meshing software. The mesh type is unstructured in all of the computational domains, and the element number is equal to 470,369.

Water Discharge

The boundary conditions are shown in the figure below.

Water Discharge

Water Discharge CFD Simulation Settings:

We consider several assumptions to simulate the present model:

  1. Due to the incompressibility of the flow, the pressure-based solver method has been selected.
  2. The simulation is transient.
  3. The gravity effect is considered equal to -9.81 m.s-2 on Y-axis.
  4. The rotational speed is deemed to be 80 rpm on Y-axis for the tank wall.

The K-epsilon standard viscous model with a Scalable wall function has solved the turbulent flow equations. The pressure-velocity coupling scheme is SIMPLE. The second-order upwind discretization method has been used for Momentum, and The first-order upwind discretization method has been used for Turbulent kinetic energy and Turbulent dissipation rate.

The following table represents a summary of the defining steps of the problem in this project and its solution:

Solver Type Pressure-based
Time Transient
Gravity X 0
Y -9.81 [m/s^2]
Z 0
Model Volume of Fluid
Number of Eulerian phases 2(air & water)
Interface modeling Sharp
Formulation Explicit
Primary phase air
Secondary phase water
k-epsilon Standard
Near wall treatment Scalable wall functions
Material Properties
Density 1.225
viscosity 1.7894e-05
Density 998.2
viscosity 0.001003
Boundary conditions
Outlet Pressure outlet
Orifice Pressure outlet
wall Moving wall
speed 80 [rev/min]
Rotation axis direction x=0,y=1,z=0
Rotation axis origin x=0,y=0,z=0 [m]
Pressure-Velocity Coupling SIMPLE
Pressure PRESTO
Momentum Second-order upwind
Turbulent kinetic energy first-order upwind
Turbulent dissipation rate first-order upwind
Volume fraction Compressive
Adaption Controls
Cell registers Region_0
Type Cylinder
Radius 0.5
X-Axis [min] 0
X-Axis[max] 0
Y- Axis [min] 0
Y- Axis [max] 0.6
Z- Axis [min] 0
Z- Axis [max] 0
Initialization methods Standard
Patch Phase water
  Variable Volume Fraction
Zones to patch Region_0
Value 1
Run calculation
Time step size 0.02
Max iterations/time step 20
Number of time steps 700


After the solution process is completed, contours of Pressure, Water volume fraction, Eddy viscosity, and Streamline are extracted. As can be observed, under the influence of gravity and the rotational speed of the tank, the water inside the cylinder tank rotates about the y-axis as it exits the orifice.



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