Hypre Fails with Navier-Stokes! - Can Anyone Try This?

Numerical methods and mathematical models of Elmer
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Hypre Fails with Navier-Stokes! - Can Anyone Try This?

Post by kishpishar » 05 Jul 2017, 13:12

Dear Elmer Users,

I have been trying to solve some flow modeling problems with Elmer's Navier-Stokes solver by using Hypre as the Linear System Solver, with no luck so far. To simplify the discussion, I am attaching a 2D model problem - i.e., the classical backward step. Water enters through the narrow end with a velocity of 1.0 m/s and exits through the wider end. The domain is 1.2 m long and the narrow and wider ends are 0.1 and 0.2 m, respectively. The turbulence is modeled using the k-Epsilon model.

What I notice is that, while Elmer's own BiCGStab solver in parallel works flawlessly (and produces the same results as a serial run), Hypre's BiCGStab solver fails to converge to the right solution.

The case and a few results are attached.

Can anyone using Hypre please help me with this?

Thx & Regds
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