NAFEMS International Journal of CFD Case Studies

Volume 11, April 2016

ISSN 1462-236X
https://doi.org/10.59972/7tlrkx6h

This 11th volume of the Journal is dedicated to the memory of Gerhard Müller whose keen enthusiasm as DACH link member to the CFD editorial board is warmly remarked upon by all those who knew him.

This volume offers a wide range of CFD application topics covering aerodynamics to gas release and river flow to oil-gas-particle flow, each presenting comparisons with experiment as validation.
The prediction of the free surface flow profile of water can result in improving the design of bridge structures. In the paper by Abo et al. a CFD model is used to simulate the 3-dimensional flow through a straight, trapezoidal cross-sectional channel containing a single bridge pier. Non-dimensional curves and equations, derived from regressions of the study data, are presented as a guideline for the design of high velocity channels containing bridge piers.
Conventional Mathematical Models typically over-predict dense toxic gas plume dispersion concentrations in complex terrain. Consequently, the emergency response plans of gas-processing industries may be less effective. In the paper by Van Bavel et al. a CFD model is used to provide better understanding of dense gas plumes dispersing in a full-scale industrial setting. The authors anticipate that this evaluation may be applied to exposure characterisation and risk assessment in industries often faced with health risks to workers.
Flight test manœuvres represent a complex and challenging fluid-structure interaction involving moving aircraft surfaces. In the paper by Van Bavel et al a CFD model, using a Lattice-Boltzmann method, offers sufficient accuracy to replace some wind-tunnel testing on the Diamond D-Jet and may help to mitigate risks associated with fully developed stalls and spin flight test manœuvres.
An important element of an engine condition monitoring system is a cyclone separator used to separate and collect circulating oil debris. The paper by Kulkarni et al presents a detailed CFD model used to resolve the anisotropic structure of the turbulent flow field and multiphase interaction within a cyclone. This study uses turbulence, multiphase and drag models to establish a CFD methodology for this application of three phase separation, validated against experimental findings.
The challenge in applying CFD technology to electronics thermal design is in simulating flow and heat transfer within a complex geometry without simplification. In the paper by Mikjaniec et al a CAD-centric CFD technology is applied to an innovative honeycomb heat-sink design for a LED lighting system. A further aspect of the study was to compare experimental, CFD and CAD-centric CFD as a validation exercise.
The final paper by de Rosa et al uses computational methods applied to the design and performance of laminar wing developed within a Italian national study programme. Here stability theory is used as an approach to laminar-turbulent transition prediction in a variety of flow conditions. A Euler method is used to evaluate the basic non viscous flow followed by the application of a boundary-layer code to both compute the boundary layer and perform a linear stability analysis. Four test cases are validated against available experimental data.

Contents

Further Details

Each of these case studies has been reviewed by members of the CFD working group to ensure that the paper includes:

• A full description of the industrial relevance of the case study and why it has been performed;
• A full description of related experimental or analytical data, together with statements as to their quality and accuracy;
• A description of the CFD model which allows the interested reader to fully appreciate how it simulates the given industrial case;
• The CFD model is detailed covering the flow physics, geometry, meshing, boundary conditions, fluid properties and the solving processes;
• A set of results are presented and discussed to facilitate the reader’s appreciation that the work has been performed well and to a high standard.

Any Journal is only as good as the papers it publishes, so the Journal needs contributors who see the importance and benefit of having their work published and used by fellow engineers. Engineers are by nature supportive of colleagues, and authoring a case study paper for the Journal gives senior engineers an opportunity to pass on their hard won knowledge and experience, and in some sense “set the standard” of practice in the field. The Journal publishes CFD case study papers, i.e. investigations, simulations and validation exercises in accordance with CFD best practice guidelines. Original papers covering either traditional CFD, multi-phase flows, combustion and topics such as parallel computing, immersed boundary methods, DNS, LES, FSI, LBM, DEM, etc. are welcomed, book reviews and letters to the Editor are also acceptable.

Potential contributors are welcome to contact the editor, Professor Don McGlinchey at cfd.journal@nafems.org to discuss any aspect of the Journal and the process, from authoring to review to publication. Further details are available here.