CFX-Intro_14.5_L06_SolverSettings_OutFile.pdf

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Lecture 06
Solver Settings and Output File
14. 5 Release
Introduction to ANSYS
CFX
© 2012 ANSYS, Inc.
December 17, 2012
1
Release 14.5
Introduction
•
Lecture Theme:
–
CFX requires inputs (solver settings) which tell it how to calculate the solution. By
introducing the concepts of accuracy, stability and convergence, the purpose of
each setting can be understood. Emphasis will be placed on convergence, which is
critical for the CFD simulation
•
Learning Aims – you will learn:
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How to select the timestep and the convergence criteria
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Solution Initialization
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How to monitor and judge the solution convergence and accuracy
•
Learning Objectives:
–
You will be able to choose appropriate solver settings for your CFD simulation and
be able to monitor and judge solution convergence
Introduction
© 2012 ANSYS, Inc.
Initialization
December 17, 2012
Solver
2
Output File
Summary
Release 14.5
Outline
•
Initialization
•
Solver:
–
–
–
–
–
Convergence Control
Residuals
Additional convergence checks
Output Control
CFX Solver Manager
•
CFX Solver Output File
•
Summary
Introduction
© 2012 ANSYS, Inc.
Initialization
December 17, 2012
Solver
3
Output File
Summary
Release 14.5
Initialization
•
Iterative solution procedures require that all solution variables are
assigned initial values before calculating a solution
•
A good initial guess can reduce the solution time
•
In some cases a poor initial guess may cause the solver to fail during the
first few iterations
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The initial values can be set in 3 ways:
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Solver automatically calculates the initial values
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Initial values are entered by the user
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Initial values are obtained from a previous solution
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Initial values can be set on a per-domain basis or globally for all domains
Introduction
© 2012 ANSYS, Inc.
Initialization
December 17, 2012
Solver
4
Output File
Summary
Release 14.5
Initialization – Setting Initial Values
•
Insert Global Initialization from the
toolbar or by right-clicking on Flow
Analysis 1
•
Edit each Domain to set initial
values on a per-domain basis
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When both are defined the domain
–
settings take precedence
Solid domain must have initial
conditions set on a per-domain
basis
Introduction
© 2012 ANSYS, Inc.
Initialization
December 17, 2012
Solver
5
Output File
Summary
Release 14.5

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