Mesh deformation and modification for time dependent problems

Baker, Timothy J.

doi:10.1002/fld.498

Cited by 12 publications

(7 citation statements)

References 13 publications

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“…php/PimpleDyMFoam), and it is second order accurate in time and space. The case required the use of moving mesh capability [32][33][34], as well as solid-body interaction with the fluid [35]. The method for handling the moving mesh is explained in detail in [36]; we selected a mesh deformation method that uses the Laplace equation (with variable diffusion) in order to determine the motion of each mesh point, while preserving the motion that is given by the moving object.…”

Section: Numerical Simulationsmentioning

confidence: 99%

Numerical Study of an Oscillating-Wing Wingmill for Ocean Current Energy Harvesting: Fluid-Solid-Body Interaction with Feedback Control

Balam-Tamayo

Málaga

Figueroa-Espinoza

2020

JMSE

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The performance and flow around an oscillating foil device for current energy extraction (a wingmill) was studied through numerical simulations. OpenFOAM was used in order to study the two-dimensional (2D) flow around a wingmill. A closed loop control law was coded in order to follow a reference angle of attack. The objective of this control law is to modify the angle of attack in order to enhance the lift force (and increase power extraction). Dimensional analysis suggests a compromise between the generator (or damper) stiffness and actuator/control gains, so a parametric study was carried out while using a new dimensionless number, called B, which represents this compromise. It was found that there is a maximum on the efficiency curve in terms of the aforementioned dimensionless parameter. The lessons that are learned from this fluid-structure and feedback coupling are discussed; this interaction, combined with the feedback dynamics, may trigger dynamic stall, thus decreasing the performance. Moreover, if the control strategy is not carefully selected, then the energy spent on the actuator may affect efficiency considerably. This type of simulation could allow for the system identification, control synthesis, and optimization of energy harvesting devices in future studies.

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Section: Numerical Simulationsmentioning

confidence: 99%

Numerical Study of an Oscillating-Wing Wingmill for Ocean Current Energy Harvesting: Fluid-Solid-Body Interaction with Feedback Control

Balam-Tamayo

Málaga

Figueroa-Espinoza

2020

JMSE

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“…After the coarsening phase, an appropriate gradation of cell size is restored by solving a Laplace equation for ρ, using the boundary mesh spacings as Dirichlet boundary conditions [17]. An approximate solution is obtained by summing the difference in the point spacing for all edges N incident to the node using a relaxation technique.…”

Section: Prescribed Point Spacingmentioning

confidence: 99%

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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“…The topic of mesh reconnection can also be extended to include refinement and derefinement of cells [7,8,9,10]. Physical phenomena can often develop over varying length scales, with near-singular solutions and large gradients in very localized regions, and in most cases, the only solution is to resolve these variations using an increased number of cells in the area.…”

Section: Introductionmentioning

confidence: 99%

Parallel adaptive simplical re-meshing for deforming domain CFD computations

Menon

Mooney

Stapf³

et al. 2015

Journal of Computational Physics

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Deforming domains occur in many fields of computational fluid dynamics (CFD), such as interface tracking, simulation of pumps and engines, and fluid/structure interaction. The deformation of the domain presents a challenge to the integrity of the computational mesh; substantial motion of the domain boundaries requires vertex motion and changes in mesh connectivity. For cases of simple boundary motion or structured meshes, predetermined changes to the mesh structure can be sufficient. However, without a priori knowledge of how the domain will change, a more robust solution is required. The present work offers a parallelized solution for simplical meshes that is well-suited to extremely complex geometry. The mesh continuously evolves without user intervention or the use of target meshes. Varying length scales imposed by evolving boundary curvatures and narrow gaps are resolved with a fast length-scale algorithm. The set of algorithms are incorporated into an object-oriented code structure that permits broad application to a range of CFD problems. The robustness and versatility of the algorithm is demonstrated in several examples, representing motion of internal and external boundaries, where the boundary motion may or may not be known a priori.

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Mesh deformation and modification for time dependent problems

Cited by 12 publications

References 13 publications

Numerical Study of an Oscillating-Wing Wingmill for Ocean Current Energy Harvesting: Fluid-Solid-Body Interaction with Feedback Control

Numerical Study of an Oscillating-Wing Wingmill for Ocean Current Energy Harvesting: Fluid-Solid-Body Interaction with Feedback Control

Parallel Unstructured Mesh Adaptation for Transient Moving Body and Aeropropulsive Applications

Parallel adaptive simplical re-meshing for deforming domain CFD computations

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