Free Surface Flow – ANSYS Fluent Training Package, 10 Practical Exercises

Description

Free Surface Flow CFD Simulation Package, ANSYS Fluent Training

This CFD training package is prepared for BEGINNER, INTERMEDIATE, and ADVANCED users of ANSYS Fluent software in the FREE SURFACE FLOW area, including 10 practical exercises. You will learn and obtain comprehensive training on how to simulate projects. The achieved knowledge will enable you to choose the most appropriate modeling approaches and methods for applications and CFD simulations.

Free Surface Flow occurs in many applications. some of these cases are investigated in this training package.

Spillway & Weir

One of the main applications of Free Surface low is in Spillways. Spillways are structures used to pass excess water and floods from the top to the bottom of the dam.

In project 1, the two-phase flow of water and air flowing over a 2-D ogee spillway by an Unsteady solver is simulated. The water will enter the computational domain with a mass flow rate of 60 tons/s and it flows over the spillway. The standard k-epsilon model is exploited to solve fluid flow equations and the VOF multiphase model is used to investigate the motion and interaction of the existing phases.

Problem 2 simulates the flow of water through a 3-D spillway by a Transient solver. Since the modeled fluids are water and air, the two-phase flow model is used. To define the two-phase flow in this simulation, a two-phase VOF (volume of fluid) model is used; So its primary phase is air and its second phase is water.

Problem 3 is an ogee spillway CFD simulation. The purpose of the present study is to investigate the behavior of water flow after passing through an ogee spillway in the presence of airflow. The main task of this type of structure (spillway) is to remove excess water in situations such as floods that water flow damages the dam body.

In analysis 4, the flow inside a Wide-Edge Spillway with Lateral Slope is investigated. It should be pointed out that there is an elevation difference between the main and sub-channel for reasons like storing a portion of flowing water. The RNG k-epsilon model is used for solving turbulent flow equations.

In project 5, the three-phase flow of water, air, and sand flowing over a Circular WEIR are simulated. The water will enter the computational domain with a velocity of 1m/s and it flows over the sand bed behind the weir. The water flow will lift some of the sand and carry it as it flows over the weir.

Canal (Free Surface)

Problem 6 simulates a counterflow in a canal. The purpose of this work is to investigate the type of fluid flow behavior when exposed to a flow in the opposite direction. In this simulation, water flows from the canal into a rectangular section horizontally, and at the same time another flow of water from a pipe lying on the floor of the same canal, horizontally but in the opposite direction of the initial flow into the canal.

Dam (Free Surface)

Numerical simulation of lifting dam has been performed in project 7. The VOF model is used to simulate two fluid phases, and the purpose of this project is to investigate the changes in the FREE SURFACE of the fluid over time. Two models are reviewed in this project. In the first model, the flow continues its path after crossing the dam, but in the second model, it encounters an obstacle.

Open Channel Flow

An open channel is a waterway channel, or artificial waterways, for water conveyance, or to service water transport vehicles.

In analysis 8, the two-phase flow of water and air inside an Open Channel is investigated. The standard k-omega model is used for solving turbulent flow equations. Also, a multi-phase VOF model with the use of an OPEN CHANNEL setting is activated to simulate two phases of water and air inside the channel.

Problem 9 simulates two-phase flow (water and air) inside an open channel with a 180-Degree Bend. To simulate the mentioned two-phase flow, the multiphase VOF model (Volume of Fluid) has been used; Because this two-phase flow is considered FREE SURFACE currents.

River

Finally, in project 10, a Numerical simulation of River Pollution has been done. The VOF model is used to simulate the phases. Pollutant enters the river from a nonuniform profile somewhere in the middle of the stagnant river, and it diffuses into the water.