ANSYS CFX Simulation General Training Course for All Levels

This project simulates a plate heat exchanger using ANSYS CFX. Four solid plates with pipes at their corners are modeled in a 2.5D geometry. Water flows through the pipes at different temperatures (20°C and 40°C) in opposite directions.

The model is created in Design Modeler and meshed using ANSYS Meshing, resulting in over 5 million elements including inflation layers in the pipes. The steady-state simulation considers conjugate heat transfer, ignoring gravity. It uses the k-Epsilon turbulence model with Scalable Wall Function and High Resolution schemes.

Results, visualized in CFD-Post, show temperature gradients, pressure, velocity, and turbulence kinetic energy. The simulation demonstrates how convection between water and pipe walls, followed by conduction through the solids, affects heat transfer. Water velocity is highlighted as a crucial factor in heat transfer efficiency.

Description: This project utilizes ANSYS CFX to simulate water flow over an ogee spillway into a pond, demonstrating the capabilities of CFD in hydraulic engineering applications.

Key features of the simulation:

1. Geometry: 2.5D model created in ANSYS Design Modeler

   • Ogee spillway connected to a pond (12m long, 3m high)

2. Meshing: Structured mesh with 55,418 elements generated in ANSYS Meshing

3. Boundary conditions:

   • Inlet: Water flow at 2 m/s

   • Outlet and upper surface: Opening type

4. Physics models:

   • Steady-state simulation

   • Gravity effects included

   • Surface tension between water and air (0.072 N/m)

   • Turbulence: k-Epsilon model with Scalable Wall Function

   • Multiphase: Homogeneous model with standard Free Surface Model

5. Numerical setup:

   • High Resolution scheme for both Advection and Turbulence Numerics

The simulation results provide insights into:

• Velocity distributions and patterns

• Volume fractions of water and air

• Static pressure changes along the flow direction

• Maximum velocity reaches approximately 6.5 m/s in highly turbulent areas

The analysis allows for the calculation of water height and mass flow rate based on the water volume fraction results.

This project showcases the application of CFD in analyzing complex hydraulic structures, offering valuable data for design optimization and performance prediction of spillways and ponds. It demonstrates how ANSYS CFX can be used to simulate free surface flows and multiphase phenomena in environmental and hydraulic engineering contexts.

This project simulates the Von Kármán effect behind a cylinder using ANSYS CFX in both steady and unsteady states. The phenomenon involves vortex shedding, creating a pattern of whirling vortices in fluid flow around blunt objects.

A 2.5D model is designed in ANSYS Design Modeler, featuring a 0.5m diameter cylinder in an airflow of 0.1m/s. The mesh, created in ANSYS Meshing, uses tetrahedral elements with refinement around the cylinder and 10 inflation layers, totaling 77,262 elements.

Both steady-state and transient simulations are performed, considering gravity and surface tension between water and air. The Shear Stress Transport (k-ε SST) turbulence model is used with High Resolution schemes and Second Order Backward Euler for transient analysis.

Results, visualized through 2D contours, vectors, and streamlines, clearly show the formation of Kármán vortex streets behind the cylinder. The periodic behavior of airflow is captured in animations, demonstrating how asymmetrical flow patterns affect pressure distribution and potentially cause vibrations due to alternating lateral forces.

This project simulates a 3D channel with a perforated plate using ANSYS CFX. Ethanol flows at 0.25m/s through a 1.2m long cylindrical domain, encountering a porous zone midway.

The 3D geometry is created in Design Modeler, with the perforated plate 55cm from inlet and outlet. ANSYS Meshing generates a structured grid of 1.3 million elements.

The steady-state simulation ignores gravity and uses the Shear Stress Transport (SST) turbulence model with High Resolution schemes. An Isotropic Porous Model with True Velocity Loss Type represents the perforated plate.

Results show a significant pressure drop as ethanol encounters the plate with 0.5 porosity. This simulation demonstrates the impact of porous media on fluid flow and pressure distribution in 3D channels.

This project simulates a boat propeller’s rotational movement using ANSYS CFX in steady-state. The propeller, designed to convert torque into thrust, is modeled in 3D using SpaceClaim software.

The simulation domain features the propeller near the inlet, with water entering at 20m/s and the propeller rotating at 1500rpm. ANSYS Meshing generates a high-quality tetrahedral mesh with 5 inflation layers, totaling over 4 million elements across stationary and rotating zones.

The steady-state simulation uses the Shear Stress Transport (k-ε SST) turbulence model, neglecting gravity. The propeller zone is set as rotating, with Frozen Rotor as the frame change model for interfaces. High Resolution schemes are applied for advection and turbulence.

Results, visualized through 2D contours, vectors, and streamlines, show velocity, pressure, eddy viscosity, and turbulence kinetic energy distributions. Animations from CFD-Post display the periodic water flow behavior, with clear visualization of pressure on the propeller and vortices in its wake.

This project simulates a boat propeller’s rotational movement in transient form using ANSYS CFX. The propeller, designed to convert torque into thrust, is modeled in 3D using SpaceClaim software.

The simulation domain features the propeller near the inlet, with water entering at 20m/s and the propeller rotating at 1500 rad/sec. The simulation runs for 0.08 seconds. ANSYS Meshing generates a high-quality tetrahedral mesh with 5 inflation layers, totaling over 4 million elements across stationary and rotating zones.

The transient simulation uses the Shear Stress Transport (k-ε SST) turbulence model, neglecting gravity. The propeller zone is set as rotating, with Transient Rotor Stator as the frame change model for interfaces. Upwind schemes, second-order backward Euler transient scheme, and first-order turbulence numerics are applied.

Results, visualized through 2D contours, vectors, and streamlines, show time-dependent velocity, pressure, eddy viscosity, and turbulence kinetic energy distributions. Animations from CFD-Post display the periodic water flow behavior, with clear visualization of pressure on the propeller and vortices in its wake over time.

This project simulates a 3D AK-47 bullet moving at 700 m/s (Mach 2.04082) through a rectangular domain using ANSYS CFX. The simulation focuses on modeling the compressible airflow around the bullet using the High Speed (Compressible) Wall Heat Transfer Model.

The geometry is created in SpaceClaim, while ANSYS Meshing generates an unstructured triangular mesh with over 3.2 million elements. The simulation uses Ideal Air Gas as the working fluid to account for compressibility effects, neglecting gravitational forces.

The high-speed nature of the bullet necessitates the use of compressible flow models and ideal gas assumptions for air density. This approach allows for accurate representation of shock waves and other high-speed aerodynamic phenomena.

Results are visualized through 2D contours of pressure, temperature, and velocity. The outputs clearly show shock wave propagation around the bullet, characterized by abrupt pressure spikes over short distances. These shock waves are evident in density, velocity, pressure, temperature, and Mach number contours. Additionally, the static pressure distribution on the bullet’s surface is presented, providing insights into the complex aerodynamics of high-speed projectile flight.

This project simulates a cylindrical combustion chamber using ANSYS CFX software. The simulation models the combustion of ethane in air, with ethane entering at 60 m/s through a small circular inlet and air at 2 m/s and 300K through the main inlet.

The geometry is created in SpaceClaim, while ANSYS Meshing generates a mesh with 1,147,748 elements. The simulation employs the Eddy Dissipation combustion model, Thermal Energy heat transfer model, and Scalable K-Epsilon turbulence model. Upwind schemes and first-order turbulence numerics are used for solution accuracy.

The reaction is defined as Ethane Air WD1, simulating the mixing and combustion process inside the chamber. The simulation captures the complex interplay of fluid dynamics, heat transfer, and chemical reactions.

Results are visualized through 2D contours, vectors, streamlines, and volume rendering, showing distributions of velocity, pressure, temperature, and mass fractions of all components. Key observations include:

1. A gradual, uniform pressure decrease inside the chamber, reaching negative values.

2. Temperature increase to over 2000K due to the combustion reaction.

3. Uniform flow patterns exiting the outlet, visible in velocity contours and vectors.

4. Detailed mass fraction distributions of reactants and products throughout the chamber.

These outputs provide comprehensive insights into the combustion process, mixing dynamics, and overall chamber performance.

This project uses ANSYS CFX to simulate copper particle transport in a bent pipe, a common challenge in various industries, particularly oil and gas. The simulation aims to understand how solid particles affect flow rates, potentially damage equipment, and accumulate in pipe bends.

The model features a 10mm diameter pipe with a 10mm bend radius and 100mm length in the Z-direction, created using SpaceClaim. ANSYS Meshing generates an unstructured mesh with 139,461 elements. Water enters at 0.05 kg/s, carrying 1-micron copper particles at 0.001 kg/s.

The simulation employs Fully Coupled Particle Transport Fluid Morphology to model particle motion, with the Scalable k-Epsilon turbulence model. High Resolution schemes are used for both Advection and Turbulence Numerics to ensure accuracy.

Key features of the methodology include:

1. Particle transport modeling in complex geometries

2. Two-phase flow simulation (water and copper particles)

3. Analysis of turbulence effects on particle distribution

Results are visualized through 2D contours, vectors, and streamlines, showing:

1. Velocity distributions

2. Pressure variations

3. Turbulence Kinetic Energy

4. Particle volume fraction

The outputs reveal important phenomena such as:

1. Detailed particle distribution throughout the pipe

2. Pressure drop along the pipe length

3. Vortex formation behind bends, potentially leading to particle accumulation

This simulation provides valuable insights into particle behavior in bent pipes, crucial for designing and maintaining efficient pipeline systems in various industries.