density driven flow on/off

hi,

i want to test the effect of the density driven flow implemented by feflow 5.3. under 'specfifc options settings' i can choose 'default' or 'extended' for the denisity coupling. i would like to run the same modell once with density coupling and once totally neglecting it in order to assess the influence on the result. does anybody know how to do this?

thanks

Density-effects are considered in the model if the density-ratio parameter in flow materials is set to a value not equal to 0. Please see the FEFLOW documentation for details about density ratio.

ok thanks a lot. i'll have to go a bit deeper into the manuals and white papers. still starting ;-)