Star CD : How to make a Graph

The aim of this little manual is to describe how to make a graph with the Star CD post processor.
You have to follow three steps :

Choosing cells :

There are two main way of getting some cells in you domain. First you have to plot your mesh :

If you know the coordinates of the cells you want to select :

Type in the command line : cset news gran xmin,xmax,ymin,ymax,zmin,zmax (where xmin,xmax,etc.. are the appropriate coordinate)
Tools -> Cell Tool..., and highlight at the top Fluid, then click on Subset -> Type (Current), and Close the cell tool.

Note that you always have to do the second point after having selected your cells.

If you want to mouse-select your cells :

On the left of the main window, click on C-> news... : if you want to pick up cells one by one : click on Cursor select and pick them up

if you want to select a zone : click on Zone and select the wanted zone.

Repeat the second point above (tools,cell tool...,fluid,subset,type(current),close)

If you want to see the selected cells : click on Cell Plot

Loading corresponding data :

Select Graph -> Load Graph Data
Highlight Load cell/vertex/sensor/wall numbers and data, and click Apply
Then choose the coordinate you want to load (X, Y, Z) in the Data to load Popup, fill the boxes as following and click load numbers and data :

Then you have to load a second data (different of a coordinate) : select in the main window Post -> Load Static Post File, Apply and close.
Select Post -> Get Cell Data, and choose the data you want, click on Load Data and Close.
Then fill the boxes as following, and click on load data :

Set and Draw your graph :

Select in the main window : Graph -> Graph Display
Then in the X axis Register scroll list highlight register no.2
Then in the Y axis Register scroll list highlight register no.3
Click Add Register Pair
Set all you want to change, click Apply Changes, and Draw Current Frame.
If you have any trouble with your graph, and particularly if it appears indesirable lines between some points, the solution is in : Graph->Graph registers.

back