Mixing stirrers are subject to severe damages when the rotational speed approaches the Eigenfrequency. Because of resonant vibrations, the stirrer deflection approaches infinity in the no damping case. Damping due to fluid-structure interaction between the mixing stirrer and the fluid in the vessel has major influence on the Eigenfrequency. Coupled analysis of the flow field within a mixing vessel and the structural dynamic response of the stirrer is necessary in order to evaluate vibrational amplitudes to guarantee life time safety for the stirrer. A simplified numerical model based on Newmark’s integration scheme is developed for the stirrer dynamics that is suitable to be implemented in a CFD code as a user subroutine. Results in terms of Eigenfrequencies are compared to results of analytical formulas and FEM results and show excellent agreement. The fully fluid-structure coupled analysis is also presented. As a new aspect, a rotating grid (sliding mesh) was combined with a deformable grid to simulate the impeller movement. The results are compared to experimental and analytical data and show good agreement.
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e-mail: t.berger@laa.mw.tum.de
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November 2003
Technical Papers
Fluid-Structure Interaction of Stirrers in Mixing Vessels
Thomas Berger,
e-mail: t.berger@laa.mw.tum.de
Thomas Berger
Technical University of Munich, Institute Pressure Vessel and Plant Design, Boltzmannstraße 15, D-85748 Garching, Germany
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Michael Fischer,
Michael Fischer
Technical University of Munich, Institute Pressure Vessel and Plant Design, Boltzmannstraße 15, D-85748 Garching, Germany
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Klaus Strohmeier
Klaus Strohmeier
Technical University of Munich, Institute Pressure Vessel and Plant Design, Boltzmannstraße 15, D-85748 Garching, Germany
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Thomas Berger
Technical University of Munich, Institute Pressure Vessel and Plant Design, Boltzmannstraße 15, D-85748 Garching, Germany
e-mail: t.berger@laa.mw.tum.de
Michael Fischer
Technical University of Munich, Institute Pressure Vessel and Plant Design, Boltzmannstraße 15, D-85748 Garching, Germany
Klaus Strohmeier
Technical University of Munich, Institute Pressure Vessel and Plant Design, Boltzmannstraße 15, D-85748 Garching, Germany
Contributed by the Pressure Vessels and Piping Division for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received by the PVP Division May 27, 2003; revision received June 1, 2003. Associate Editor: S. Y. Zamrik.
J. Pressure Vessel Technol. Nov 2003, 125(4): 440-445 (6 pages)
Published Online: November 4, 2003
Article history
Received:
May 27, 2003
Revised:
June 1, 2003
Online:
November 4, 2003
Citation
Berger, T., Fischer , M., and Strohmeier, K. (November 4, 2003). "Fluid-Structure Interaction of Stirrers in Mixing Vessels ." ASME. J. Pressure Vessel Technol. November 2003; 125(4): 440–445. https://doi.org/10.1115/1.1613951
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