| 1. |
- Asnaghi, Abolfazl, 1984, et al.
(författare)
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Shear Stress Effects in Cavitating Flows
- 2014
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Ingår i: Numerical Towing Tank Symposium. ; , s. 6-
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The current study focuses on the improvement of phase change pressure threshold estimation in the cavitatingflows and its effects on the cavity characteristics. Effects of viscous shear stresses have been considered in thecalculation of the tensile strength, and the liquid pocket rupturing. This method is used in the numericalsimulation of the cavitating flows around the 3D Twisted Delft foil. Obtained numerical results are comparedwith experimental data. It is concluded that the using this medication will improve the prediction of the cavitysize even in medium speed flows around foils, and propellers.
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| 2. |
- Cesur, Alper, et al.
(författare)
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Analysis of the wake dynamics of stiff and flexible cantilever beams using POD and DMD
- 2014
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Ingår i: Computers and Fluids. - : Elsevier BV. - 0045-7930. ; 101, s. 27-41
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Tidskriftsartikel (refereegranskat)abstract
- The wake flow behind a cantilever beam of quadratic cross-section at a Reynolds number of 50,000 is investigated using detailed simulations. Two cases are considered, the first one using a stiff beam and the second one with a beam allowing for elastic deformation due to the hydrodynamic forces. The flow is simulated using an implicit large eddy simulation (ILES) approach in OpenFOAM and the structural deformation of the beam is found from a non-linear finite element approach using OOFEM. The motion of the fluid mesh due to the structural deformation is handled by an ALE method. The wake structures are investigated using proper orthogonal decomposition (POD) and dynamic mode decomposition (DMD) of the flow field. The results show that apart from the wake structures originating from the vortex shedding there is also a low frequency mode, which is an oscillatory motion in the stream-wise direction, present.
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