In this work we extend the hybrid Discontinuous Galerkin/ Finite Volume framework, introduced in V. Maltsev, D. Yuan, K. W. Jenkins, M. Skote, P. Tsoutsanis, “Hybrid discontinuous Galerkin-finite volume techniques for compressible flows on unstructured meshes, Journal of Computational Physics 473 (2023)” [1], to multi-species problems involving gas-gas and gas-liquid systems. The numerical scheme achieves high order accuracy smooth flow regions thanks DG discretisation, yet avoiding...

The paper extends weighted essentially non-oscillatory (WENO) schemes to two-dimensional quadrilateral and mixed-element unstructured meshes.The key element of the proposed methods is a reconstruction procedure suitable for arbitrarilyshaped cells.The resulting achieve designed uniformly high-order accuracy compute discontinuous solutions without spurious oscillations at interfaces between cells two different types.

UCNS3D is an open-source computational solver for compressible flows on unstructured meshes. State-of-the-art high-order methods and their associated benefits can now be implemented industrial-scale CFD problems due to the flexibility highly-automated generation offered by We present governing equations of physical models employed in UCNS3D, numerical framework developed solution. The code has been designed so that extended other systems straightforward. are validated towards a series...

In the present work, aerodynamic performance of Caradonna and Tung S-76 in hover were investigated using a simplified concept multiple reference frame (MRF) technique context high-order Monotone Upstream Centred Scheme for Conservation Laws (MUSCL) cell-centred finite volume method. methodology, is defined at solver level by simple user input avoiding use mesh interface to handle intersections between frames reference. The calculations made both out-of-ground-effect (OGE) in-ground-effect...

This paper explores the impact of definition bounds limiter proposed by Michalak and Ollivier-Gooch in [56] (2009), for higher-order Monotone-Upstream Central Scheme Conservation Laws (MUSCL) numerical schemes on unstructured meshes finite-volume (FV) framework. A new modification is where are redefined utilising all spatial information provided elements reconstruction stencil. Numerical results obtained smooth discontinuous test problems Euler equations meshes, highlight that newly extended...

In this paper a relaxed formulation of the posteriori Multi-dimensional Optimal Order Detection (MOOD) limiting approach is introduced for weighted essentially non-oscillatory (WENO) finite volume schemes on unstructured meshes. The main goal to minimise computational footprint MOOD by employing WENO schemes—by virtue requiring smaller number cells reduce their order accuracy compared an unlimited scheme. key characteristic present that Numerical Admissible Detector (NAD) not uniquely...

Abstract In this paper we extend the application of unstructured high-order finite-volume central-weighted essentially non-oscillatory (CWENO) schemes to multicomponent flows using interface capturing paradigm. The developed method achieves accurate solution in smooth regions, while providing oscillation free solutions at discontinuous regions. are inherently compact sense that central stencils employed as possible, and directional reduced size, therefore simplifying their implementation....

In this paper the assessment and enhancement of computational performance a high-order finite volume CFD code is presented. Weighted Essentially Non-Oscillatory (WENO) schemes are considered to be from most computationally expensive numerical frameworks, in context high-resolution particularly on hybrid unstructured grids. The focus study assess bottlenecks solver for WENO Implicit Large Eddy Simulation (ILES) optimise efficiency through series modifications e.g. formula rewriting, reduction...

In this paper the relaxed, high-order, Multidimensional Optimal Order Detection (MOOD) framework is extended to simulation of compressible multicomponent flows on unstructured meshes. The diffuse interface methods (DIM) paradigm used that employs a five-equation model. implementation performed in open-source high-order flow solver UCNS3D. CWENO spatial discretisation selected due its reduced computational footprint and improved non-oscillatory behaviour compared original WENO variant....

It is well known that a shroud placed around wind turbine can increase its power coefficient, but it brings complex mechanisms by which the alters flow passing through rotor. Such impose numerical challenges, as shrouded turbines present nonlinear behaviour in wake. This paper deals with comprehensive analysis of tip vortex trajectory using Reynolds Averaged Navier–Stokes solutions. The includes aerodynamic performance and characteristics whole turbine. Multiple Reference Frame used on...

This paper concerns the implementation and evaluation of high-order reconstruction schemes for predicting three well established hovering rotor flows i.e. Caradonna Tung, PSP UH-60A. Monotone Upstream Centred Scheme Conservation Laws (MUSCL) Weighted Essentially Non-Oscillatory (WENO) spatial discretisation schemes, up to fourth-order, are employed approximate compressible Reynolds Averaged Navier-Stokes (RANS) equations in a rotating reference frame, on mixed-element unstructured grids....

In this paper we develop a family of arbitrarily high-order non-oscillatory hybrid Discontinuous Galerkin(DG)-Finite Volume(FV) schemes for mixed-element unstructured meshes. Their key ingredient is switch between DG method and FV based on the CWENOZ scheme when invalid solutions are detected by troubled cell indicator checking unlimited solution. Therefore, high order accuracy offered preserved in smooth regions computational domain, while robustness utilized with strong gradients. The...

Cooling drag, typically known as the difference in drag coefficient between open and closed cooling configurations, has traditionally proven to be a difficult flow phenomenon predict using computational fluid dynamics.It was seen an academic yardstick before advent of grille shutter systems.However, their introduction increased need accurately vehicle variety different configurations during development.This currently represents one greatest predictive challenges automotive industry due being...

Cavitation resulting from underwater explosions in compressible multiphase or multicomponent flows presents significant challenges due to the dynamic nature of shock–cavitation–structure interactions, as well complex and discontinuous involved interfaces. Achieving accurate resolution interfaces between different phases components, presence shocks, cavitating regions, structural is crucial for modeling such problems. Furthermore, pressure convergence simulations involving interactions...

In the present work, aerodynamic performance of full helicopter PSP in hover flight is investigated using a simplified concept multiple reference frame (MRF) technique context high-order Monotone Upstream Centred Scheme for Conservation Laws (MUSCL) cell-centred finite volume method. The predictions were obtained two ground distances and several collective pitch angle at tip Mach number 0.585. calculations made both out-of-ground-effect (OGE) in-ground-effect (IGE) cases compared with...

In this paper, a family of stencil selection algorithms is presented for WENO schemes on unstructured meshes. The associated freedom meshes, in the context present plethora various algorithms. particular focus paper to assess performance algorithm, investigate parameters that dictate their robustness, accuracy and computational efficiency. Ultimately, efficient robust stencils are pursued can provide significant savings performance, while retaining non-oscillatory character schemes. This...