An approach of dynamic mesh adaptation for simulating 3‐dimensional unsteady moving‐immersed‐boundary flows

Peng, Boyu; Zhou, Chunhua

doi:10.1002/fld.4486

Cited by 5 publications

(3 citation statements)

References 41 publications

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“…The size of the solution domain is 14 L × 4 L × 2 L . The approach of dynamic mesh adaptation proposed by Peng and Zhou is employed and the initial uniform mesh contains 57 × 23 × 13 = 17 043 nodes. For the adaptive meshes, the mesh interval near the fish surface is about 6 × 10 −3 .…”

Section: Numerical Experimentsmentioning

confidence: 99%

Extension of the local domain‐free discretization method to large eddy simulation of turbulent flows

Zhou

2019

Numerical Methods in Fluids

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Summary In this work, an immersed boundary method, called the local domain‐free discretization (DFD) method, is extended to large eddy simulation (LES) of turbulent flows. The discrete form of partial differential equations at an interior node may involve some nodes outside the solution domain. The flow variables at these exterior dependent nodes are evaluated via linear extrapolation along the direction normal to the wall. To alleviate the requirement of mesh resolution in the near‐wall region, a wall model based on the turbulence boundary layer equations is introduced. The wall shear stress yielded by the wall model and the no‐penetration condition are enforced at the immersed boundary to evaluate the velocity components at an exterior dependent node. For turbulence closure, a dynamic subgrid scale (SGS) model is adopted and the Lagrangian averaging procedure is used to compute the model coefficient. The SGS eddy viscosity at an exterior dependent node is set to be equal to that at the outer layer. To maintain the mass conservation near the immersed boundary, a mass source/sink term is added into the continuity equation. Numerical experiments on relatively coarse meshes with stationary or moving solid boundaries have been conducted to verify the ability of the present LES‐DFD method. The predicted results agree well with the published experimental or numerical data.

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Section: Numerical Experimentsmentioning

confidence: 99%

Extension of the local domain‐free discretization method to large eddy simulation of turbulent flows

Zhou

2019

Numerical Methods in Fluids

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“…A crucial step in the numerical prediction of water entry is the simulation of large deformation of the free interface and the boundary conditions of the dynamic mesh [10]. The simulation of large deformation of free interface mainly includes two types: one is the interface tracking technology, and the other is the interface capture technology [11].…”

Section: Introductionmentioning

confidence: 99%

Research on Aerodynamic Characteristics of Trans-Media Vehicles Entering and Exiting the Water in Still Water and Wave Environments

Wei

Sha

et al. 2023

Drones

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The problem of aircraft entering and exiting water is a complex, nonlinear, strongly disturbed, and multi-coupled multiphase flow problem, which involves the precise capture of the air/water interface and the multi-coupling interaction between aircraft, water, and air. Moreover, due to the large difference in medium properties during the crossing, the load on the body will suddenly change. In this paper, the VOF (volume of fluid) algorithm is used to capture the liquid surface at the air/water interface, and since body movement is involved in this process, the overset grid technology is used to avoid the traditional dynamic grid deformation problem. In the process of this numerical simulation prediction, the effects of different water-entry angles and different water-entry heights on the body load and attitude of the trans-medium aircraft, as well as the cavitation evolution law of the body water entry are analyzed. On this basis, to simulate the authenticity and complexity of the water-entry environment, numerical wave-making technology was introduced to analyze the water-entry load, posture, and cavitation evolution law of the body under different wave environments. The numerical parameters under the condition of wave and no wave are compared, and the difference in water-entry performance under the condition of wave and no wave is analyzed.

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“…Since then this technique has been applied and developed by many researchers (Chen, Lien and Leschziner, 1997;Henshaw and Schwendeman, 2008;Holst and Pulliam, 2009;Angelidis, Chawdhary and Sotiropoulos, 2016). Although AMR method is accurate and efficient for steady problems (Alauzet and Loseille, 2010;Jones, Nielsen and Park, 2006;Michal and Krakos, 2012) several drawbacks are associated with this method for unsteady flows (Hornung, Wissink and Kohn, 2006;Alauzet et al, 2018;Peng and Zhou, 2018;Angelidis et al, 2016). The most important problem is the latency between the mesh and flow solution.…”

Section: Introductionmentioning

confidence: 99%

A parallel dynamic overset grid framework for immersed boundary methods

Hedayat¹,

Borazjani²

2019

Preprint

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A parallel dynamic overset framework has been developed for the curvilinear immersed boundary (overset-CURVIB) method to enable tackling a wide range of challenging flow problems. The dynamic overset grids are used to locally increase the grid resolution near complex immersed bodies, which are handled using a sharp interface immersed boundary method, undergoing large movements as well as arbitrary relative motions. The new framework extends the previous overset-CURVIB method with fixed overset grids and a sequential grid assembly to moving overset grids with an efficient parallel grid assembly. In addition, a new method for the interpolation of variables at the grid boundaries is developed which can drastically decrease the execution time and increase the parallel efficiency of our framework compared to the previous strategy. The moving/rotating overset grids are solved in a non-inertial frame of reference to avoid recalculating the curvilinear metrics of transformation while the background/stationary grids are solved in the inertial frame. The new framework is verified and validated against experimental data, and analytical/benchmark solutions. In addition, the results of the overset grid are compared with results over a similar single grid. The method is shown to be 2nd order accurate, decrease the computational cost relative to a single grid, and good overall parallel speedup. The grid assembly takes less than 7% of the total cpu time even at the highest number of cpus tested in this work. The capabilities of our method are demonstrated by simulating the flow past a school of self-propelled aquatic swimmers arranged initially in a diamond pattern.

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An approach of dynamic mesh adaptation for simulating 3‐dimensional unsteady moving‐immersed‐boundary flows

Cited by 5 publications

References 41 publications

Extension of the local domain‐free discretization method to large eddy simulation of turbulent flows

Extension of the local domain‐free discretization method to large eddy simulation of turbulent flows

Research on Aerodynamic Characteristics of Trans-Media Vehicles Entering and Exiting the Water in Still Water and Wave Environments

A parallel dynamic overset grid framework for immersed boundary methods

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