Is it possible to run Simulink calculations in parallel mode on cluster? And if its possible then what actually Simulink do when number of processes that i need is more than cluster has nodes? Thank you.
You can use the Parallel Computing Toolbox from MathWorks (the page has links to the documentation).
This is a quick how-to to start: http://www.mathworks.com/support/solutions/en/data/1-6GRUQ3/index.html?product=DM&solution=1-6GRUQ3
I don't know what is the exact behavior of this toolbox when there are more processes than nodes but it's in its documentation for sure.