An immersed boundary method with implicit body force for compressible viscous flow

Yu, Hang; Pantano, Carlos

doi:10.1016/j.jcp.2022.111125

Cited by 13 publications

(6 citation statements)

References 62 publications

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“…They were always considered unfeasible due to the prohibitive computational cost required to run the analysis; however, the advent of GPU technology for parallel computing is enabling the usage of Large-Eddy Simulations [6], making them the most groundbreaking approach now available and increasing dramatically both the spatial and temporal resolution of the obtained results thus improving the quality and the quantity of the captured details. Furthermore, Immersed Boundary Methods, which are fundamental to deal effectively with moving solid boundaries, have received more attention recently [7], enabling the application of computational strategies for compressible flows that are able to solve the fluid-solid interface of porous thin structures and shells. Still, all of the analysis that have been performed on the matter up to now were not able to draw together all of these novel aspects, limiting the findings.…”

Section: Case Study and Intended Approachmentioning

confidence: 99%

High-fidelity simulation of a supersonic parachute for Mars descent

Placco

2023

Materials Research Proceedings

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Abstract. The project aims to characterize the unsteady dynamics of the parachute-capsule in a supersonic flow during the descent phase on planetary entry. Presently, Large-Eddy Simulation in combination with an Immersed-Boundary Method is employed to analyze the time-evolving flow of a rigid supersonic parachute trailing behind a reentry capsule during the descent phase through Mars atmosphere. The flow is simulated at Ma = 2 and Re = 106. A massive GPU parallelization is employed to allow a very high fidelity solution of the multiscale turbulent structures present in the flow that characterize its dynamics. We show how the interaction of wake turbulent structures with the bow shock produced by the supersonic decelerator induces strong unsteady dynamics. This unsteady phenomenon called ‘breathing instability’ is strictly related to the ingestion of turbulence by the parachute’s canopy and is responsible of drag variations and structure oscillations observed during previous missions and experimental campaigns. The next steps will take into account the flexibility of the parachute.

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Section: Case Study and Intended Approachmentioning

confidence: 99%

High-fidelity simulation of a supersonic parachute for Mars descent

Placco

2023

Materials Research Proceedings

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“…The implicit scheme is also recommended since the boundary condition can be satisfied easily (Le et al. 2009; Obeidat & Bordas 2019; Yu & Pantano 2022). Different IB methods have their own advantages and disadvantages for flows with moving boundaries.…”

Section: Introductionmentioning

confidence: 99%

“…Yang et al (2009) and Gazzola et al (2011) recommended that the smooth discrete delta function be employed to avoid the spurious elastic effects and force oscillations mentioned above. The implicit scheme is also recommended since the boundary condition can be satisfied easily (Le et al 2009;Obeidat & Bordas 2019;Yu & Pantano 2022). Different IB methods have their own advantages and disadvantages for flows with moving boundaries.…”

Section: Introductionmentioning

confidence: 99%

Investigation of hydrodynamics of water impact and tail slamming of high-speed water entry with a novel immersed boundary method

et al. 2023

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High-speed water entry is a transient hydrodynamic process that is accompanied by strongly compressible flow, free surface splash, cavity evolution and other nonlinear hydrodynamic phenomena. To address these problems, a novel fluid–structure interaction (FSI) scheme based on the immersed boundary method is proposed which is suitable for strongly compressible multiphase flows. In this scheme, considering the multiphase interfaces at the immersed boundary, an improved immersed boundary method for effectively suppressing the non-physical force oscillation is proposed. Additionally, a quaternion-based six degrees of freedom motion system is used to describe rigid body motion, and the multiphase flow Eulerian finite element method is applied as the fluid solver. Using analytical solutions, experimental data and literature data, the accuracy and robustness of the FSI scheme are validated. Finally, the high-speed water entry of the slender body with different noses is investigated, and the hydrodynamic loads including the axial and normal drag forces and the bending moment are extensively discussed. The hydrodynamic load and motion trajectory are determined by the nose configuration. The tail slamming phenomenon is the primary focus, and it is revealed that its formation is primarily related to the pitch moment formed at the stage of crossing the free surface. Tail slamming also causes violent impact loads, especially bending moments, which may cause slender projectiles to break off. Finally, to combine the features of the flat and hemispherical noses, the water entry of the projectile with a truncated hemispherical nose is simulated and discussed.

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“…The predicted results showed good agreements with the published experimental data and numerical result. Huang and Carlos (2022) presented a new IBM for the simulation of compressible viscous flow. The method was based on the singular source approach where the immersed boundary added surface singularities to the governing equations.…”

Section: Introductionmentioning

confidence: 99%

The study of vertical-axis wind turbine based on immersed boundary method

Yang,

Cheng,

Song

2023

Energy Exploration & Exploitation

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In this article, a modified immersed boundary method (IBM) with a ghost-cells strategy is introduced to study a kind of vertical-axis wind turbine (VAWT). In order to improve the accuracy of the numerical calculation and enhance its adaptability, some treatments on the IBM for the VAWT especially are carried out. The method is testified by the numerical simulation of an Eppler387 airfoil. With the help of the method, some flowing characteristics of the wind turbine have been thoroughly observed and understood. Furthermore, the effects of blade shape, tip vortex and secondary flowing on the turbine performance are discussed in detail based on the numerical results.

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An immersed boundary method with implicit body force for compressible viscous flow

Cited by 13 publications

References 62 publications

High-fidelity simulation of a supersonic parachute for Mars descent

High-fidelity simulation of a supersonic parachute for Mars descent

Investigation of hydrodynamics of water impact and tail slamming of high-speed water entry with a novel immersed boundary method

The study of vertical-axis wind turbine based on immersed boundary method

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