how to save the variable values at some points every time step
 

Dear friends:
could you please tell me how to save the variable values at some points or lines every time steps. since the mesh size is very large.
Regards

in CFX-Pre create a Monitor Point with the desired expression or variable (pressure etc). In the solver manager, you can add a new monitor with that new monitor point. You can export the data for every time step from the solver manager as CSV-file.

Appart from the monitor points you can also extract these values from a transient run in cfx post by using perl scripts
Have a look at the thread
http://www.cfd-online.com/Forums/cfx...tml#post385850
especially at the posted example file
Maybe it could help you

How to write the CSV file automatically by the CFX each time step

This I don't know.
But when you reach the end of your simulation, you have the whole progress of your monitored value, and you can export the whole curve / data set to the csv file.
You don't need to do the export for each time step...