Efficient Large-Eddy Simulation Method for Blade Trailing-Edge Cooling Optimization

Zhang, M.; He, L.

doi:10.2514/1.b36501

Cited by 9 publications

(3 citation statements)

References 30 publications

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“…From the present author's viewpoint, the conditioning improvement might perhaps have more to do with the turbulent eddy viscosity being introduced in the reformulation than the Reynolds stresses being added implicitly or explicitly. Closely relevantly, the role of the eddy viscosity in stabilizing Reynolds stress driven solution is also reported earlier by He 9 for a reformulated mixing-length eddy-viscosity model, and Zhang and He 34 for a reformulated one-equation S-A model. The common link is believed to arise from the basic property that the eddy-viscosity tends to dampen out disturbances (physically or numerically originated) which may otherwise grow into instabilities.…”

Section: Balanced Eddy Viscosity (Bev) Damping For Source-term Driven...supporting

confidence: 72%

“…The preference is made not just because of the author's own previous implementation and operational experience of the method. Compared to the one‐equation model of Zhang and He, 34 the explicit mixing‐length model is simpler and more efficient computationally. The implicit eddy viscosity formulation of Wu et al 33 needs an inversion of the mean flow strain for a simple adoption, which may cause numerical difficulties for complex flow with nearly zero local strains.…”

Section: Methods Implementationmentioning

confidence: 99%

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Two‐scale conjugate heat transfer solution for micro‐structured surface

2023

Numerical Methods in Fluids

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The primary challenges for simulating a turbulent flow over a micro‐structured surface arise from the two hugely disparate spatial length scales. For fluid–solid coupled conjugate heat transfer (CHT), there is also a time‐scale disparity. The present work addresses the scale disparities based on a two‐scale framework. For the spatial scale disparity, a dual meshing is employed to couple a global coarse‐mesh domain with local fine‐mesh blocks around micro‐structures through source terms generated from the local fine‐mesh and propagated to the global coarse‐mesh domain. The convergence and robustness of the source terms driven coarse‐mesh solution is enhanced by a balanced eddy‐viscosity damping. In this work, the two‐scale method previously developed only for a fluid‐domain is extended to a solid domain so that thermal conduction around micro‐elements can now be resolved accurately and efficiently. The fluid–solid timescale disparity is dealt with by a frequency domain approach. The time‐averaged (zeroth harmonic) is effectively obtained in the same way as steady CHT. And remarkably, wall temperature unsteadiness can be simply obtained from the fluid temperature harmonics through a wall fluid–solid temperature harmonic transfer‐function at minimal computational cost. The developed CHT capability is validated for an experimental internal cooling channel with multiple surface rib‐elements. For a test configuration with 100 micro‐structures, the fluid domain‐only, the solid domain‐only and the fluid–solid coupled CHT solutions are analyzed respectively to examine and demonstrate the validity of the present framework and implementation methods. Some of the results also serve to illustrate the primary underlying working of the methodology.

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Section: Balanced Eddy Viscosity (Bev) Damping For Source-term Driven...supporting

confidence: 72%

Section: Methods Implementationmentioning

confidence: 99%

Two‐scale conjugate heat transfer solution for micro‐structured surface

2023

Numerical Methods in Fluids

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“…However, it can also be possibly evaluated without knowing the detailed discretization process, which is particularly useful for a commercial solver as in the present case (CFX). The steady/time-averaged source term is computed in an iterative manner [37,52] and applied to CFX using an existing general source term model for each governing equation. The algorithm of the iteration process can be found in Appendix A.…”

Section: Steady/time-averaged Source Term Calculationmentioning

confidence: 99%

Efficient Steady and Unsteady Flow Modeling for Arbitrarily Mis-Staggered Bladerow Under Influence of Inlet Distortion

Phan

2021

Journal of Engineering for Gas Turbines and Power

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Accurate and efficient predictions of the steady and unsteady flow responses due to the blade-to-blade variation as well as due to the non-axisymmetric inlet distortion have been continually pursued. Computation of two problems concurrently has been rarely done in the past partly because of the need to perform whole annulus bladerow simulations, despite the advances in the current state-of-the-art methods with the phase-shift single passage simulations. The current work attempts to deal with this challenge by developing a new computational approach based on the principle of the multiscale method in the framework of a commercial solver (CFX). The methodology formulation relies on summation of the constituent source terms, each of which corresponds to a particular flow perturbation. The source term element corresponding to the blade-to-blade variation effect is linearly superimposed as in the classical Influence Coefficient Method. The unsteady flow field around a blade at any time instant depends only on its relative position to all its neighbouring blades, so that the influences of an arbitrarily mis-staggered bladerow can be computed efficiently. In addition, the source term arisen due to the inlet distortion is calculated based on the spatial Fourier transform. A key enabler is that the source terms can be pre-computed using a small set of identical blade passages. The source term is then propagated to different spatial and temporal locations ... Please find the completed abstract below.

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Numerical Study on Vortex Analysis of the Blade Airfoil for Wind Turbines During Icing Process

Zhang,

Xu,

et al. 2024

Springer Proceedings in Physics

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Efficient Large-Eddy Simulation Method for Blade Trailing-Edge Cooling Optimization

Cited by 9 publications

References 30 publications

Two‐scale conjugate heat transfer solution for micro‐structured surface

Two‐scale conjugate heat transfer solution for micro‐structured surface

Efficient Steady and Unsteady Flow Modeling for Arbitrarily Mis-Staggered Bladerow Under Influence of Inlet Distortion

Numerical Study on Vortex Analysis of the Blade Airfoil for Wind Turbines During Icing Process

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