# Example 2: automatic preparation of a series of Flux projects ready to be solved

## Objective

The objective is to study 3 specific configurations of a parameterized device.

## Example description

The studied device is a simple geometrical figure (quadrilateral) defined using 6 parameters: X1, Y1, X2, Y2, X3, Y3.

This command file could be used to create different Flux projects in 2D.

## Process

The process includes the following stages:

Stage Description Context
1 Preparing a Flux project which contains the base geometry Flux
2 Saving in a command file the sequence of the geometry modification with mesh rebuilding Flux
3 Modification of the previous command file using the PyFlux language Text editor
4 Executing this file to test it Flux

## Stage 1

To build the basic geometrical figure on which the modifications will be carried out, to carry out the following procedure:

Step Action
1 Open a new Flux project
2

Build the geometry:

• create the following 6 geometric parameters:

X1 = 20, Y1 = 0, X2 = 0, Y2 = 10, X3 = 20, Y3 = 10

• create the following 4 points:

(0, 0); (X1, Y1); (X2, Y2); (X3, Y3);

• create the 4 lines to close a rectangle with these 4 points
• build the faces
3

Mesh the device:

• modify the value of the MEDIUM Mesh line (value: 1 mm)
• assign the MEDIUM Mesh line to the 4 points
• mesh the faces
4 Save the project under the name BASE.FLU

## Stage 1: final result

The project BASE.FLU contains:

• 6 parameters,
• 4 points ((3 are parameterized))
• 4 lines (segments)
• 1 meshed face

## Stage 2

To save in a command file the sequence of modification:

Step Action
1 Create a command file ModifParam.py
2

Carry out the modification actions:

• delete the mesh (to enable the geometrical modification)
• modify the value of a geometric parameter
• mesh the faces
• save the project under another name
3 Close the command file

## Stage 2: final result

The command file ModifParam.py containing the saved sequence is presented as follows:

## Stage 3

To modify the previous command file using the PyFlux syntax:

Step Action
1 Write a function in the PyFlux language, which enables the automatic creation of a Flux project (corresponding to a set of parameters) starting from a base project BASE.FLU.
2 Write the calls of the previous function to create the 3 desired cases
3 Save the command file

## Stage 3: file explanation

The command file ModifyParam.py containing the modify() function and the calls of this function is presented as follows:

Element Function
#! Preflu2D 9.33
indication on the executable program
def modify(VX1,VY1,VX2,VY2,VX3,VY3,case)
:

definition of the modify() function having as input 7 parameters

(6 numerical values to define the geometric parameters X1, Y1, X2, Y2, X3, Y3 and 1 string to define the name of the project)

deleteMesh()
deletion of the mesh
ParameterGeom['X1'].expression= str(VX1)
...

modification of geometric parameter

(X1 takes the value VX1 , converted into string by the method s tr() ,

…)

meshFaces()
meshing faces
saveProjectAs(case)
saving the project under the name defined by the input parameter case
modify(10,0,0,10,20,10,"Case1")
...

call of the function to build the first case,

## Stage 4

Run the command file.

## Stage 4: final result

After running the command file, the user has in his/her working directory 4 Flux projects, whose characteristics are given in the table below.

BASE.FLU CASE1.FLU CASE2.FLU CASE3.FLU
P1: ( 0, 0) P1: ( 0, 0) P1: ( 0, 0) P1: ( 0, 0)
P2: (20, 0) P2: (10, 0) P2: (10, 0) P2: (10, 0)
P3: ( 0, 10) P3: ( 0, 10) P3: (10, 10) P3: ( 0, 10)
P4: (20, 10) P4: (20, 10) P4: (20, 10) P4: (15, 5)