Tutorial: Solver

Notice

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Outline

The topics that will be covered in the tutorial are the following:

Introduction
Flow Simulation Model
Heat Ratio Model
Iterations
Visual Output File
Additional Options
Configuring the Solver Settings in the ADS Workbench

Introduction

The flow solver, Code Leo, is an advanced finite volume solver that has been optimized with decades of experience to provide a fast and accurate solution for general flow configurations. Below are some of the key qualities of Code Leo:

Capable of Handling Structured, Unstructured, and Hybrid Structured/Unstructured Grids.
Low Speed to Supersonic Flow Fields
Steady State or Time Accurate Flow Simulations
Heat Conduction Module with Support for Conjugate Heat Transfer
Executes over a Large Network of PCs using Standard MPI Routines

One of Code Leo's main advantages is its high numerical accuracy. This is due to the following:

Cell Vertex Finite Volume Approximation to the Governing Equations
Advanced Distribution Formulae for Convection/Propagation of Waves
Low Artificial Numerical Damping
2nd Order Accurate in Time and Space even for Highly Skewed Mesh

Furthermore, Code Leo provides fast convergence through the use of the following:

Local Time Step
Pre-Conditioning with Gauge Pressure to Speed Up Convergence for Low Speed Flow Problems
Convergence Acceleration using Residual Propagation for Unstructured Mesh and Multi-Grid Scheme for Structured Mesh
Dual Time Stepping for Fast Time Accurate Simulations

Flow Simulation Model

Code Leo allows users to select between the following flow simulation models:

Laminar or Inviscid Flow Simulation
Turbulent Flow Simulation
Turbulent Flow with Wilcox's Transitional Model

Heat Ratio Model

Code Leo allows users to select between various specific heat ratio options. The options are the following:

Constant Specific Heat Ratio
Variable Gas Properties of Air
Variable Gas Properties for N% of Theoretical Air with Fuel of CH2

Iterations

Code Leo allows users to set several variables specific to the iterations. The variables are the following:

NITER: Number of Iterations
IPRT: Number of iterations between printing of aerodynamic performance
NIRST: Number of iterations between RESTART file generation

Visual Output File

Code Leo allows users to write out visual output files for the solution at the final iteration. The options for the file format are the following:

Tecplot Format
Plot3D Format
VTK Format

Additional Options

Code Leo allows users several additional funtions. Some of the funtion are the following:

Change Back Pressure by a Percentage
Change Back Pressure to a New Amount
Change RPM by a Percentage
Change RPM to a New Amount

Configuring the Solver Settings in the ADS Workbench

Solver settings can be added to a simulation through the ADS Workbench. This is done through the standard case setup UI. Below is the figure that shows where the solver settings are added.

ADS Workbench: Solver Settings