Yes, I think so; I bet matters on the RHS's and LHS's in the solves are more order one,

in the fast case. You can check this yourself of course.



From: firedrake-bounces@imperial.ac.uk <firedrake-bounces@imperial.ac.uk> on behalf of Anna Kalogirou <A.Kalogirou@leeds.ac.uk>
Sent: Thursday, May 11, 2017 10:13 AM
To: firedrake@imperial.ac.uk
Subject: [firedrake] Simulation time sensitive to form of equations
 
Dear all,

I have noticed that when I divide one of my equations in a mixed system by the time step dt, the simulation time drops by more than half -- from 7m13s to 3m7s for the same simulation. Is there an explanation why this might be happening?

Regards,

Anna.
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