Elements of computational fluid dynamics on block structured grids using implicit solvers

Badcock, K. J.; Richards, B. E.; Woodgate, M.

doi:10.1016/s0376-0421(00)00005-1

Cited by 145 publications

(89 citation statements)

References 62 publications

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“…The example code used in the current work is the Parallel Multiblock Code (PMB) [2]. The Euler and RANS equations are discretised on curvilinear multi-block body conforming grids using a cell-centred finite volume method which converts the partial differential equations into a set of ordinary differential equations.…”

Section: Cfd Methodsmentioning

confidence: 99%

Automated CFD Analysis for the Investigation of Flight Handling Qualities

Ghoreyshi

Badcock

Ronch

et al. 2011

Math. Model. Nat. Phenom.

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Abstract. Physics based simulation is widely seen as a way of increasing the information about aircraft designs earlier in their definition, thus helping with the avoidance of unanticipated problems as the design is refined. This paper reports on an effort to assess the automated use of computational fluid dynamics level aerodynamics for the development of tables for flight dynamics analysis at the conceptual stage. These tables are then used to calculate handling qualities measures. The methodological questions addressed are a)geometry and mesh treatment for automated analysis from a high level conceptual aircraft description and b) sampling and data fusion to allow the timely calculation of large data tables. The test case used to illustrate the approaches is based on a refined design passenger jet wind tunnel model. This model is reduced to a conceptual description, and the ability of this geometry to allow calculations relevant to the final design to be drawn is then examined. Data tables are then generated and handling qualities calculated.

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Section: Cfd Methodsmentioning

confidence: 99%

Automated CFD Analysis for the Investigation of Flight Handling Qualities

Ghoreyshi

Badcock

Ronch

et al. 2011

Math. Model. Nat. Phenom.

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“…Owing to the several advantages discussed in [9], a blockstructured grid [10][11][12] with matching/nonoverlapping interfaces was adopted in the present study. The domain was divided into five blocks and each block was further subdivided into finite control volumes.…”

Section: Mathematical Formulation and Numerical Methodsmentioning

confidence: 99%

“…The governing equation, Eq. (1), in the physical space (X i , i¼1,2,3) was first transformed to the computational space (x i , i¼1,2,3) and takes the following form after the coordinate transformation [10,11].…”

Section: Governing Equations In Curvilinear Coordinatesmentioning

confidence: 99%

Role of characteristic modes in the dynamics of wave pattern in the Czochralski oxide crystal growth

Jing

Chen

et al. 2012

Journal of Crystal Growth

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a b s t r a c tWave pattern is a flow pattern observed on the free surface of oxide melt in the Czockralski crucible. Wave pattern exhibits regular folds in the azimuthal direction. In this paper three-dimensional flows of the LiNbO 3 melt in a Czockralski crucible of radius r c ¼ 100 mm and crystal radius r s ¼ 50 mm were investigated. The crucible is still and the crystal is rotating at a rate O s . The flow is assumed to be laminar. The governing equations of the melt flows were solved by a block-structured boundary-fittedcoordinate method. Massive numerical simulations were first conducted to obtain several stable n-folded wave patterns by changing aspect ratio A¼ h/r c and O s , where h is the depth of the oxide melt. The proper orthogonal decomposition was then applied to extract the characteristic modes of the n-folded original wave patterns. The spatial feature of the characteristic modes and the role of the characteristic modes in the dynamic process of the original wave patterns were finally analyzed. Some interesting conclusions are obtained. The characteristic modes of the wave patterns show strong spatial feature. The characteristic modes have more folds in the azimuthal direction than the original wave patterns; the characteristic modes appear in group; with the increase of group order, the number of folds in the azimuthal direction is increased regularly by n for the n-folded original wave pattern. The study of the dynamic process shows that the original wave pattern is a traveling wave, which is formed by the dominant characteristic modes.

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“…The SST model has been used for many external flows with adverse pressure gradients. The solver also has been used and validated for several fundamental flows apart from rotor cases (Badcock et al 2000;Gagliardi and Barakos 2008).…”

Section: Cfd Flow Solvermentioning

confidence: 99%

Performance and Wake Analysis of Rotors in Axial Flight Using Computational Fluid Dynamics

Mohd¹,

Barakos²

2017

J.Aerosp. Technol. Manag.

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Flow field around rotors in axial flight is known to be complex especially in steep descent where the rotor is operating inside its own wake. It is often reported that, in this flight condition, the rotor is susceptible to severe wake interactions causing unsteady blade load, severe vibration, loss of performance, as well as poor control and handling. So far, there is little data from experimental and numerical analysis available for rotors in axial flight. In this paper, the steady Reynolds-Averaged Navier-Stokes Computational Fluid Dynamics solver Helicopter Multi-Block was used to predict the performance of rotors in axial flight. The main objective of this study was to improve the basic knowledge about the subject and to validate the flow solver used. The results obtained are presented in the form of surface pressure, rotor performance parameters, and vortex wake trajectories. The detailed velocity field of the tip vortex for a rotor in hover was also investigated, and a strong self-similarity of the swirl velocity profile was found. The predicted results obtained when compared with available experimental data showed a reasonably agreement for hover and descent rate, suggesting unsteady solution for rotors in vortex-ring state.

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Elements of computational fluid dynamics on block structured grids using implicit solvers

Cited by 145 publications

References 62 publications

Automated CFD Analysis for the Investigation of Flight Handling Qualities

Automated CFD Analysis for the Investigation of Flight Handling Qualities

Role of characteristic modes in the dynamics of wave pattern in the Czochralski oxide crystal growth

Performance and Wake Analysis of Rotors in Axial Flight Using Computational Fluid Dynamics

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