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The Design – Two Phase Fluid Flow (VOF) Simulation | ANSYS Fluent

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A spillway or an overflow channel is a structure for controlling the overflow of a dam in case of a flood in order to protect the dam from destruction. The spillway provides a path for the dam to release some of the water to reduce the amount of water and the pressure. There are different kinds of spillways. Some of them are located at the top of the dam while the others could be located in another place like the bottom. We have open channel spillways, Bell-mouth spillways, siphon spillways, etc. for designing spillways one of the most important factors is the largest flood they can handle. For the CFD simulation of spillways, we have to take into consideration free surface flow effects. An overflow flow overflow is one of the most common CFD studies. With this analysis, we can find information such as speed and fluid pressure in different locations. This information can help in picking up energy from the fluid by the turbine to select its type and size. Because air is always present as the second fluid, this problem is treated in two phases.

In this analysis, an overflow current flow is simulated and analyzed in both continuous and transient conditions by the ANSYS Fluent software.

The Design – Two Phase Fluid Flow (VOF) Simulation | ANSYS Fluent

A spillway or an overflow channel is a structure for controlling the overflow of a dam in case of a flood in order to protect the dam from destruction. The spillway provides a path for the dam to release some of the water to reduce the amount of water and the pressure. There are different kinds of spillways. Some of them are located at the top of the dam while the others could be located in another place like the bottom. We have open channel spillways, Bell-mouth spillways, siphon spillways, etc. for designing spillways one of the most important factors is the largest flood they can handle. For the CFD simulation of spillways, we have to take into consideration free surface flow effects. An overflow flow overflow is one of the most common CFD studies. With this analysis, we can find information such as speed and fluid pressure in different locations. This information can help in picking up energy from the fluid by the turbine to select its type and size. Because air is always present as the second fluid, this problem is treated in two phases.

In this analysis, an overflow current flow is simulated and analyzed in both continuous and transient conditions by the ANSYS Fluent software.

Geometry & Grid

The geometry required for flow analysis in a spillway or an overflow channel design modeler is produced by ANSYS Fluent software. The generated grid is also produced by the same software for this geometry, which is entire of an unstructured type.

The volume properties of the geometry model for these a spillway or an overflow channel design modeler geometry are 9.746e+008 mm².

Model

To analyze the current turbulence, the K-epsilon Standard turbulence viscosity model is used. The standard wall function is used near the wall. To analyze the two-phase flow, VOF multiphase model was used in this analysis.

Boundary Condition

The flow input is defined as a velocity magnitude Inlet and is about 0.02 m/s for water. Stream output is also considered as a Pressure Outlet.

Discretization of Equations

To solve the equations in this analysis, the Piso algorithm is used to solve coupling speed and pressure equations. Also, a pressure-based solution for flow resolution is used. The Second Order Upwind method is used to discriminate equations.

In the end, the results are shown as contours of pressure.

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We also accept all CFD projects using ANSYS Fluent and ANSYS CFX. Our workshop has gathered experts in different engineering fields so as to ensure the quality of CFD simulations. One of our objectives is to boost the use of powerful computational fluid dynamics methods and also teach the engineers and those who seek professional knowledge in CFD.

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