Parallel finite element simulation of 3D incompressible flows: Fluid-structure interactions.

*(English)*Zbl 0873.76047The authors present numerical results for unsteady incompressible three-dimensional flows, including those with fluid-structure interactions. These computations in time-varying spatial domains are carried out on the AHPCRC supercomputers CM-200 and CM-5 with provision for major speed-ups compared with traditional supercomputers, based on the massively parallel implementations of the deforming spatial domain and on stabilized space-time finite element formulations.

The capability to solve three-dimensional problems involving fluid-structure interactions is demonstrated by investigating the dynamics of a flexible cantilevered pipe conveying fluid. Good agreement with observations by other researchers is obtained. Computations of flow past a stationary rectangular wing confirm the presence of wing tip vortices. An interesting pattern of vortex shedding is observed at Reynolds number 2500. In these computations, at each time step, approximately \(3\times 10^6\) nonlinear equations are solved to update the flow field.

Preliminary results are presented for flow past a wing in flapping motion based on description of the flight of birds given by J. Lighthill [An informal introduction to theoretical fluid mechanics. Oxford: Clarendon Press (1986; Zbl 0604.76002)]. The use of a specially designed mesh-moving scheme in conjunction with the stabilized space-time formulation eliminates the need for remeshing, ensures high accuracy of solutions, and aids in the efficient utilization of the massively parallel computers.

The capability to solve three-dimensional problems involving fluid-structure interactions is demonstrated by investigating the dynamics of a flexible cantilevered pipe conveying fluid. Good agreement with observations by other researchers is obtained. Computations of flow past a stationary rectangular wing confirm the presence of wing tip vortices. An interesting pattern of vortex shedding is observed at Reynolds number 2500. In these computations, at each time step, approximately \(3\times 10^6\) nonlinear equations are solved to update the flow field.

Preliminary results are presented for flow past a wing in flapping motion based on description of the flight of birds given by J. Lighthill [An informal introduction to theoretical fluid mechanics. Oxford: Clarendon Press (1986; Zbl 0604.76002)]. The use of a specially designed mesh-moving scheme in conjunction with the stabilized space-time formulation eliminates the need for remeshing, ensures high accuracy of solutions, and aids in the efficient utilization of the massively parallel computers.

Reviewer: H.K.Verma (Ludhiana)

##### MSC:

76M10 | Finite element methods applied to problems in fluid mechanics |

76D05 | Navier-Stokes equations for incompressible viscous fluids |

74F10 | Fluid-solid interactions (including aero- and hydro-elasticity, porosity, etc.) |

65Y05 | Parallel numerical computation |

##### Keywords:

AHPCRC supercomputer; time-varying spatial domains; flexible cantilevered pipe; stationary rectangular wing; wing tip vortices; vortex shedding; flapping motion; flight of birds; mesh-moving scheme; stabilized space-time formulation
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\textit{S. Mittal} and \textit{T. E. Tezduyar}, Int. J. Numer. Methods Fluids 21, No. 10, 933--953 (1995; Zbl 0873.76047)

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