User Subroutines

Course Duration: 2 days
Course Schedule: To suit users requirements

Who Should Attend

It is recommended that users who will be using these subroutines to implement their own models, boundary conditions, etc, attend this course.

Course Aims

The course is aimed at giving the User an understanding of how to set up a model containing user subroutines. Hands-on experience is gained by the use of worked examples. The course also offers the User the opportunity to discuss the application of user subroutines to their cases with an experienced Engineer.

Course Structure

The course structure is designed to take the User through the various stages of setting up a case that uses these subroutines. Worked examples are used throughout the course to give hands-on experience.

Course Content

The content of the course, based on the above aims and structure, is as follows;

1) Introduction : This section introduces the concept of user subroutines and why they form an important part of the functionality of STAR-CD.

2) What can they do : This section discusses what user subroutines can do in terms of defining boundary conditions, material properties, source terms, droplets and extracting flow field data during the solution process.

3) How are they activated : This section discusses the system command ufile, which is used to create the ufile directory, and the PROSTAR User Subroutine panel. It also discusses the activation of user subroutines using either the GUI or the command line and their compilation using the starlink command.

4) When are they called : This section discusses when user subroutines are called and which subroutines access/supply boundary and cell data. It also illustrates the order in which they are called.

5) What is passed to them : This section reviews the variables passed by the include file usrdat.inc and cell mapping between STAR-CD and PROSTAR. It then discusses the declaration of arrays and types which are passed to the user subroutine.

6) What is returned by them : This section defines which variables are passed in the user subroutine argument list as arrays and as single values. It also discusses the passing of information between subroutines and how to store this information.

7) Special Topics : This section discusses the setting up of these subroutines for parallel calculations and using STAR-CD source common blocks to obtain other data. It also covers programming style, skills and Fortran 77. Throughout the course worked examples are used to give hands-on experience.

Course Requirements
The User should have a good working knowledge of PROSTAR, STAR-CD and the Fortran 77 programming language.