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

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

This product includes Geometry & Mesh file and a comprehensive Training Movie.
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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 Â 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.

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.

The boundary conditions are shown in the figure below.

## 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:

 General Solver Type Pressure-based Time Transient Gravity X 0 Y -9.81 [m/s^2] Z 0 Models Multiphase Model Volume of Fluid Number of Eulerian phases 2(air & water) Interface modeling Sharp Formulation Explicit Primary phase air Secondary phase water Viscous k-epsilon Standard Near wall treatment Scalable wall functions Material Properties Air Density 1.225 viscosity 1.7894e-05 water-liquid 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] Methods 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 Initialization methods Standard Patch Phase water Â 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

## Â Results

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.

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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