Hydraulic Structure & Civil ANSYS Fluent Training Package, 10 Practical Exercises for ADVANCED Users

Description

Hydraulic Structure & Civil ANSYS Fluent Training Package, 10 Practical Exercises for ADVANCED Users

This Training Package includes 10 practical exercises that are numerically simulated by ANSYS Fluent software for ADVANCED users in the field of Hydraulic Structures and Civil engineering.

Water Turbine (Hydraulic Structure)

We start this training package with study number 1 which investigates the water flow on the horizontal axis water turbine (HAWT) blades so that the purpose of the problem is to investigate the distribution of velocity and pressure on the wall of the blade. There are two areas around the blades, including a cylindrical area as the rotational zone just around the blades, and a large area around the cylinder as the stationary zone. The flow of water in the large outer space behaves like a normal flow, while in the cylindrical region around the blades, the rotational flow is caused by the rotational motion of the blades.

Problem number 4 simulates the water flow around a Darrieus vertical-axis water turbine submerged in water using the dynamic mesh method. The water turbine is from the category of vertical axis turbines and is of the Darrieus type; So that the axis of the turbine is perpendicular to the direction of water flow. For this simulation, a vertical axis turbine with three blades is designed within a relatively large computational domain in which the computational area has only water flow.

The water wheel is an example of a Pelton turbine that is simulated in practical exercise number 9. In order to solve the fluid flow equations, the averaged form of the Navier-Stokes equation is used. The two-phase model also uses is the VOF model. The turbine’s diameter is 0.7 m and the boundary of the free surface is actually 0.2 m below the center of the water wheel.  In this CFD simulation, the rotational speed of the turbine is 60 rpm. For the present issue, we should use the MESH MOTION.

Open Channel Flow

In analysis number 2, 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 number 7 simulates two-phase flow (water and air) inside an open channel with a 180-degree arc. 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 flow.

Spillway (Hydraulic Structure)

In practical exercise number 3, the flow inside a wide-edge spillway with a 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.

Paper Numerical Validation

Problem number 5 simulates the separation of fluid flow passing through a step and the effect of suction and blower control jets on controlling the separation of fluid. This simulation is based on the information of a reference article “A force reduced-order approach for optimal control of turbulent flow over backward-facing step using POD analysis and perturbation method“, and its results are compared and validated with the results in the article. In this simulation, the fluid flow enters the channel horizontally at a speed equivalent to 1 ms-1 and then passes through a step to a height of 1 m within 30 m inside the channel, leading to separation.

Sedimentation (Hydraulic Structure)

Problem number 6 simulates sand particle sedimentation in a water flow channel. The sedimentation phenomenon is one of the destructive phenomena in the quality of performance of any equipment. Sedimentation can occur when the base fluid contains excess soluble particles.

Water Pollution

In project number 8, a Numerical simulation of pollution in a stagnant river 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 river, and it diffuses into the water. Due to its density which is lower than water density, it floats on the free surface of the river. Finally, in practical exercise number 10, a numerical simulation of pollution of the meandering river has been done. The VOF model has been used to simulate and solve the two-phase flow field equations. Pollutant enters the river from two circular inlet profiles somewhere at the beginning of the river, and it diffuses into the water. Due to its density which is lower than water density, pollutants cause the river’s surface to be polluted, and because of the water flow, pollution moves along the river.

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