A hybrid RANS-LES Cartesian method based on a skew-symmetric convective operator

Capizzano, Francesco; Alterio, Luigi; Russo, Serena; Nicola, C. de

doi:10.1016/j.jcp.2019.04.002

Cited by 8 publications

(4 citation statements)

References 40 publications

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“…8. A similar observation is made by Ask and Davidson 16,23 , Capizzano et al 18 , Rung et al 14 , and Yu et al 22 for their numerical results.…”

Section: Validation and Verification Studysupporting

confidence: 83%

“…From a numerical perspective, several turbulence modelling approaches have been carried out by researchers for hydrodynamic pressure fluctuations on both the mirror and plate. 5,[14][15][16][17][18][19][20][21][22] The efforts based on Unsteady Reynolds Averaged Navier Stokes (URANS) and Ffowcs Williams-Hawkings (FW-H) approaches 12,13 have shown to yield a difference of up to 7dB in Sound Pressure Levels (SPL) recorded with microphones positioned around the mirror for frequencies ranging from 200 -300 Hz, but beyond 300 Hz they show considerable disparity with experimental data and the pressure fluctuations predicted at sensors located on the mirror and the plate flatten out after 200 Hz indicating the limitation of the RANS models in resolving the intricate details of the flow which are necessary to capture high-frequency modes. Ask and Davidson 16,23,24 compared both Detached Eddy Simulation (DES) with Spalart-Allmaras (SA) and Large Eddy Simulation (LES) models with grid resolution following LES recommendations by Pope 25 with specific modifications made to the grid on HRM to avoid Grid Induced Separation (GIS).…”

Section: A the Generic Side View Mirrormentioning

confidence: 99%

“…The PPW is consistent and at instances offer better resolution compared to the previously published numerical studies on HRM with other hybrid RANS/LES cases. 5,14,[16][17][18]22…”

Section: B Grid Generation and Solution Setupmentioning

confidence: 99%

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Noise emitted from a generic side-view mirror with different aspect ratios and inclinations

2021

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Noise radiated from flow past different configurations of the Half-Round Mirror (HRM) mounted on a plate has been investigated using computational aeroacoustics (CAA).The Stress-Blended Eddy Simulation (SBES), together with the Ffowcs Williams-Hawkings (FW-H) acoustic analogy, was employed to predict near field flow and far-field noise, respectively. The numerical methodology was verified and validated for the standard HRM case against several previously published numerical and experimental data sets, which provides good agreement. Further, (i) the choice of different type of grids for CAA and (ii) the applicability of methods such as the Kirchhoff integral and the FW-H using near field inputs computed from the SBES were assessed. As a next step, the effect of induced noise from the HRM for different a) Aspect Ratios (AR) ranging from 1 to 2.5 and b) inclination of the mirror towards the plate (θ) ranging from 0° to 32° were investigated. For all the investigated cases, the distribution of the radiated noise exhibits a dipole-like structure closer to the plate and a monopole-like structure away from the plate. By inclining the mirror closer to the mounting plate, the emitted noise is reduced both in the vertical and lateral directions of the wake, whereas an increase in the AR of the mirror increases the induced noise considerably. The findings from the current study can provide a deeper understanding for effectively mitigating the induced aerodynamic noise from side-view mirrors.

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“…8. A similar observation is made by Ask and Davidson 16,23 , Capizzano et al 18 , Rung et al 14 , and Yu et al 22 for their numerical results.…”

Section: Validation and Verification Studysupporting

confidence: 83%

Section: A the Generic Side View Mirrormentioning

confidence: 99%

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Noise emitted from a generic side-view mirror with different aspect ratios and inclinations

2021

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“…The present research starts from an unstructured IB framework specifically developed to speed up and automate as much as possible the simulation of unsteady viscous flows around stationary configurations (Capizzano, 2018;Capizzano et al, 2019). The governing equations are the three-dimensional unsteady compressible Navier-Stokes (NaS) whose basic conservative variables are the density, the mass flux vector and the total energy per unit volume (r , r u, r v, r w, r E).…”

Section: Numerical Backgroundmentioning

confidence: 99%

Studying the deployment of high-lift devices by using dynamic immersed boundaries

Capizzano

Sucipto

2021

AEAT

Self Cite

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Purpose This paper aims to describe a research effort towards the comprehension of the unsteady phenomena due to the deployment of high-lift devices at approach/landing conditions. Design/methodology/approach The work starts from a preexisting platform based on an immersed boundary (IB) method whose capabilities are extended to study compressible and viscous flows around moving/deforming objects. A hybrid Lagrangian-Eulerian approach is designed to consider the motion of multiple bodies through a fixed Cartesian mesh. That is, the cells’ volumes do not move in space but rather they observe the solid walls crossing themselves. A dynamic discrete forcing makes use of a moving least-square procedure which has been validated by simulating well-known benchmarks available for rigid body motions. Partitioned fluid-structure interactions (FSI) strategies are explored to consider aeroelastic phenomena. A shared platform, between the aerodynamic and the structural solvers, fulfils the loads’ transfer and drives the sequence of the operating steps. Findings The first part of the results is devoted to a basic two-dimensional study aiming at evaluating the accuracy of the method when simple rigid motions are prescribed. Afterwards, the paper discusses the solution obtained when applying the dynamic IB method to the rigid deployment of a Krueger-flap. The final section discusses the aeroelastic behaviour of a three-element airfoil during its deployment phase. A loose FSI coupling is applied for estimating the possible loads’ downgrade. Research limitations/implications The IB surfaces are allowed to move less than one IB-cell size at each time-step de-facto restricting the Courant-Friedrichs-Lewy (CFL) based on the wall velocity to be smaller than unity. The violation of this constraint would impair the explicit character of the method. Practical implications The proposed method improves automation in FSI numerical analysis and relaxes the human expertise/effort for meshing the computational domain around complex three-dimensional geometries. The logical consequence is an overall speed-up of the simulation process. Originality/value The value of the paper consists in demonstrating the applicability of dynamic IB techniques for studying high-lift devices. In particular, the proposed Cartesian method does not want to compete with body-conforming ones whose accuracy remains generally superior. Rather, the merit of this research is to propose a fast and automatic simulation system as a viable alternative to classic multi-block structured, chimaera or unstructured tools.

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Anisotropic Cartesian Grid Generation Strategy for Arbitrarily Complex Geometry Based on a Fully Threaded Tree

Meng

Zhou²,

Lin³

et al. 2023

Computer-Aided Design

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A hybrid RANS-LES Cartesian method based on a skew-symmetric convective operator

Cited by 8 publications

References 40 publications

Noise emitted from a generic side-view mirror with different aspect ratios and inclinations

Noise emitted from a generic side-view mirror with different aspect ratios and inclinations

Studying the deployment of high-lift devices by using dynamic immersed boundaries

Anisotropic Cartesian Grid Generation Strategy for Arbitrarily Complex Geometry Based on a Fully Threaded Tree

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