شبیه سازی موتور احتراق داخلی دارای سوپاپ (Canted Valve Engine) با شبکه هیبریدی

در این مثال یک موتور احتراق داخلی با هندسه مشخص و با روش هیبریدی شبکه بندی شده است. در ادامه نمایی از مسئله به همراه نتایج آن آمده است.

ادامه نوشته

Heave and Pitch Simulation of Ship hull moving through head sea waves - دوفازی و دینامیک مش

Introduction
Ships moving through head sea waves predominantly encounter heave and pitch motions while the other four motions (roll, yaw, surge, sway) are negligible. In this tutorial a wigley hull heave and pitch motion is simulated in head sea waves

This tutorial demonstrates how to do the following

 Use VOF multiphase model of Fluent to solve open channel flow

 Use open channel wave boundary condition to generate shallow waves

 Use Numerical Beach option to suppress the numerical reflection near the outlet

 Use dynamic mesh six-dof feature to model motion of the hull

 Restrict 4 degree of motions out of 6 degree using User defined Function - UDF

 Post-process the resulting data

ادامه نوشته

Store Separation from a 3D Delta Wing - دینامیک مش شش درجه آزادی

Introduction
This tutorial illustrates the setup and simulation of store separation from an airplane wing.The
flow is inviscid and compressible. The objective of this simulation is to model the motion of the store using the Six Degrees of Freedom (6DOF) solver in FLUENT. The results of the FLUENT simulation are compared with the results computed from a series of wind tunnel tests. For the details about the wind tunnel testing, refer to Appendix. This tutorial demonstrates how to do the following

  Use the DEFINE SDOF PROPERTIES macro to specify the mass matrix and any external forces/moments

 Use the dynamic mesh (DM) feature in FLUENT

Set up a compressible, transonic flow (Mach 1.2) in FLUENT

Set the boundary conditions

 Set up dynamic adaption

 Obtain a first order solution using the density-based implicit solver

ادامه نوشته

Solving a 2D Vibromixer Problem Using the Dynamic Mesh Model - دینامیک مش - ویبرومیکسر

Introduction
The dynamic mesh model in FLUENT can be used to model flows where the shape of the domain is changing with time due to motion on the domain boundaries. The motion can be either a prescribed motion (e.g., you can specify the linear and angular velocities about the center of gravity of a solid body with time) or an un-prescribed motion where the subsequent motion is determined through a user-defined function
The update of the volume mesh is handled automatically by FLUENT at each time step
based on the new positions of the boundaries. To use the dynamic mesh model, you need
to provide a starting volume mesh and the description of the motion of any moving zones
in the model
This tutorial demonstrates the use of FLUENT's dynamic mesh capabilities for a vibromixer a device with a perforated (cylindrical) plate of small thickness that moves with a sinusoidal motion which is implemented through a UDF

ادامه نوشته

مش دینامیک - Projectile Moving Inside a Barrel

Introduction
The purpose of this tutorial is to illustrate how to set up and solve a problem using the following two features in FLUENT

Moving Deforming Mesh (MDM) using the layering algorithm -

User-defined real gas law -

The problem involves a projectile moving through a barrel and out of the muzzle. The flow is assumed to be inviscid. In this tutorial you will learn how to
Read a mesh file for performing an MDM calculation -
Compile a UDF for the projectile motion and the Abel-Nobel real gas law -
Set up the moving zones and hook the UDF in FLUENT -
 Run an unsteady calculation for the problem using coupled solver and axisymmetry -
Create animations

-

ادامه نوشته

مش دینامیک - 2D Adiabatic Compression - Remeshing and Spring Smoothing

Introduction

This tutorial illustrates the setup and solution of a basic deforming mesh in FLUENT 6.2 using the remeshing and spring-based smoothing approaches

The dynamic mesh model in FLUENT can be used to model ows where the shape of the domain changes with time due to motion on the domain boundaries. The motion can be either a prescribed motion (e.g., you can specify the linear and angular velocities about the center of gravity of a solid body with time), or an unprescribed motion where the subsequent motion is determined by a user-defined function (UDF). The update of the volume mesh is handled automatically by FLUENT at each time step based on the new positions of the boundaries. To use the dynamic mesh model, you need to provide a starting volume mesh and the description of the motion of any moving zone in the model

In this tutorial, you will use the spring-based smoothing and remeshing mesh motion methods to update the volume mesh in the deforming region. For zones with a triangular or tetrahedral mesh, spring-based smoothing can be used to adjust the interior node locations based on known displacements at the boundary nodes. The spring-based smoothing method updates the volume mesh without changing the mesh connectivity

When the boundary displacement is large compared to the local cell sizes, the cell quality may deteriorate or the cells may become degenerate. This leads to convergence problems when the solution is updated to the next time step. To circumvent this problem, FLUENT agglomerates poor-quality cells (cells that are too large, too small, or are excessively stretched) and locally remeshes the agglomeration

ادامه نوشته

مش دینامیک - 2D Adiabatic Compression - Layering

 

Introduction

This tutorial illustrates the setup and solution of a basic deforming mesh in FLUENT using the layering approach

The dynamic mesh model in FLUENT can be used to model fows where the shape of the domain is changing with time due to motion on the domain boundaries.  The motion can be either a prescribed motion (e.g., you can specify the linear and angular velocities about the center of gravity of a solid body with time) or an unprescribed motion where the subsequent motion is determined through a user-de fined function (UDF). The update of the volume mesh is handled automatically by FLUENT at each time step based on the new positions of the boundaries. To use the dynamic mesh model, you need to provide a starting volume mesh and the description of the motion of any moving zones in the model

In this tutorial, you will use the layering mesh motion method to update the volume mesh in the deforming region. You will setup and solve the case for both types of layering; Bottom Layering and Top Layering. Layering can be used to add or remove layers of cells adjacent to a moving boundary based on the height of the layer adjacent to the moving surface. The first part will involve Bottom Layering, and the second part the Top Layering. The dynamic mesh model in FLUENT allows an ideal layer height to be specified on each moving boundary. The layer of cells adjacent to the moving boundary is subdivided or merged with the layer of cells next to it based on the height of the cells in the moving boundary

ادامه نوشته