Calculate Gradient of Hydrostatic stress

Question

Hi,
I am novice FEniCS user:
I have to calculate Gradient of Hydrostatic stress.

although this problem is simple but I am not getting any idea. Small help will save my time and improve my result.

Thanks

Comments

if you don't give us a working example of your attempt we can't help you

Answer 1

Look at this exemplo:

http://fenicsproject.org/qa/11671/gradient-of-hydrstatic-stress-becomes-zero?show=12473#a12473