the timisoara swirl generator openfoam case-study · svensk vattenkraft centrum - svc 10 • the...

Chalmers University of Technology

Svensk Vattenkraft Centrum - SVC

The Timisoara Swirl Generator OpenFOAM case-study

Olivier Petit, Håkan Nilsson Chalmers University

6th OpenFOAM workshop

Penn State University, USA

13-16 June 2011



•  Designed to create the flow features of a Francis turbine operating at part load

•  Create a detailed measurement database to understand and better control the precessing vortex rope in the draft tube

• Develop OpenFOAM as the future first choice for industrial CFD in water turbine applications (create tutorials, validate new implementations useful for Turbomachinery applications)



•  Four leaned strouts • 13 guide vanes •  Free runner with 10 blades • Convergent divergent draft tube • Free spinning runner (torque=0), omega=9200 rpm



•  2.8 Millions cell, Hexaedral mesh

•  Boundary condition at the inlet: plug-flow with nominal discharge 30 l/s

•  Omega = 920 rpm (for which the runner spins freely in OpenFOAM)

•  Unsteady simulation using k-ε turbulence model

GGI GGI

GGI



Section 1

Section 2



Axis 0

Axis 1

Axis 2



Case1: maxCo =5, Case2: maxCo=1



10

•  The case study covers various objectives of the Turbo Working Group:

– Validation test case for different solvers

– Collaboration

– Easy diffusion

•  More test cases can be added to this case study, we invite more people to participate.

•  A lot more information can be found at http://openfoamwiki.net/index.php/Sig_Turbomachinery

the timisoara swirl generator openfoam case-study · svensk vattenkraft centrum - svc 10 • the...

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