Dynamic unstructured grid methodology with application to aero/propulsive flowfields

Cavallo, Peter A.; Hosangadi, Ashvin; Lee, Robert A.; Dash, S. M.

doi:10.2514/6.1997-2310

Cited by 25 publications

(12 citation statements)

References 7 publications

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“…Some comparisons of the robustness of mesh movement strategies have been published [14,26,32,73], although they are far from comprehensive. The lineal spring analogy is generally discredited on all but invsicid problems with relatively small mesh movements.…”

Section: Mesh Movementmentioning

confidence: 99%

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Methods for simulation-based analysis of fluid-structure interaction.

Barone¹,

Payne²

2005

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Methods for analysis of fluid-structure interaction using high fidelity simulations are critically reviewed. First, a literature review of modern numerical techniques for simulation of aeroelastic phenomena is presented. The review focuses on methods contained within the arbitrary Lagrangian-Eulerian (ALE) framework for coupling computational fluid dynamics codes to computational structural mechanics codes. The review treats mesh movement algorithms, the role of the geometric conservation law, time advancement schemes, wetted surface interface strategies, and some representative applications. The complexity and computational expense of coupled NavierStokes/structural dynamics simulations points to the need for reduced order modeling to facilitate parametric analysis. The proper orthogonal decomposition (POD)/Galerkin projection approach for building a reduced order model (ROM) is presented, along with ideas for extension of the methodology to allow construction of ROMs based on data generated from ALE simulations.3

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Section: Mesh Movementmentioning

confidence: 99%

“…Substituting the POD decomposition for u into (14), applying the algebraic rules of inner products along with orthogonality of the POD basis gives…”

Section: Galerkin Projectionmentioning

confidence: 99%

Methods for simulation-based analysis of fluid-structure interaction.

Barone¹,

Payne²

2005

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“…Once the interstage connector clears the upper stage nozzle exit plane, cell extrusion techniques may be applied to automate the task of handling grid motion [11,20]. Such an approach is suitable for 1-D motions and could simplify the analysis once the initial separation is completed using the adaptive methods shown here.…”

Section: Rocket Stage Separationmentioning

confidence: 99%

“…as the additional fluxes generated by the moving control volume faces are taken into account [11]. For efficient computation of large 3-D problems, a parallel framework for distributed memory systems has been implemented along with an implicit sparse matrix solver, permitting large CFL numbers.…”

Section: Performing Organization Name(s) and Address(es)mentioning

confidence: 99%

“…Given a change in the boundary mesh, resulting from a rigid body motion, structural deformation, or design process, the interior nodes of the tetrahedral grid are redistributed by means of a generalized node movement solver. The method models the tetrahedral mesh as a deformable, elastic solid, subject to the equations of elasticity [11].…”

Section: Grid Movement Proceduresmentioning

confidence: 99%

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Parallel Unstructured Mesh Adaptation for Transient Moving Body and Aeropropulsive Applications

Cavallo

Sinha

Feldman

2004

42nd AIAA Aerospace Sciences Meeting and Exhibit

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*Adaptive, unstructured grid methods, in which the mesh is allowed to deform, and grid quality subsequently restored through localized coarsening and refinement, offer the potential of a more rapid, straightforward approach to generalized moving body problems. Automation of this mesh movement and quality correction strategy requires a close coupling with the flow solution process. With parallel simulations now common, parallel coarsening and refinement methods for moving meshes are needed. In this work, parallel mesh adaptation strategies are developed to treat deforming, decomposed domains. Distortion of the moving mesh is assessed using a deformation matrix analysis. A two-pass approach is implemented in which cell migration shifts the interprocessor boundary, thereby accommodating coarsening and refinement of the interprocessor faces. The adapted grids are rebalanced among the processors using available techniques. Representative cases are presented to demonstrate the parallel approach and maintenance of cell quality for practical separation events.

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Two‐dimensional implicit time‐dependent calculations on adaptive unstructured meshes with time evolving boundaries

Lin

Baker

Martinelli

et al. 2005

Numerical Methods in Fluids

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SUMMARYAn implicit multigrid-driven algorithm for two-dimensional incompressible laminar viscous ows has been coupled with a solution adaptation method and a mesh movement method for boundary movement. Time-dependent calculations are performed implicitly by regarding each time step as a steady-state problem in pseudo-time. The method of artiÿcial compressibility is used to solve the ow equations. The solution mesh adaptation method performs local mesh reÿnement using an incremental Delaunay algorithm and mesh coarsening by means of edge collapse. Mesh movement is achieved by modeling the computational domain as an elastic solid and solving the equilibrium equations for the stress ÿeld. The solution adaptation method has been validated by comparison with experimental results and other computational results for low Reynolds number ow over a shedding circular cylinder. Preliminary validation of the mesh movement method has been demonstrated by a comparison with experimental results of an oscillating airfoil and with computational results for an oscillating cylinder.

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Dynamic unstructured grid methodology with application to aero/propulsive flowfields

Cited by 25 publications

References 7 publications

Methods for simulation-based analysis of fluid-structure interaction.

Methods for simulation-based analysis of fluid-structure interaction.

Parallel Unstructured Mesh Adaptation for Transient Moving Body and Aeropropulsive Applications

Two‐dimensional implicit time‐dependent calculations on adaptive unstructured meshes with time evolving boundaries

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