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International Journal of CFD Case Studies - Volume 10

International Journal of CFD Case Studies - Volume 10

The papers in this 10th volume of the Journal offer a wide range of CFD application topics each presenting comparisons with experiment as validation.

Technical textile fabrics have many uses, one such use, is in the paper making industry. In the paper by Farber et al water needs to flow through a textile with specific properties, requiring much trial testing of the fabric structure. A technique of “weaving” single cylindrical filaments together is used to create a small sample of a commercial fabric. The sample is used to simulate an experimental set up where water flows through the fabric and velocities are compared to Magnetic Resonance Imaging results.

Friction stir welding of metals is a new technology with equipment design largely relying on empirical data from welding performance tests. The process is highly non-linear comprising complex heat transfer, metal plastic deformation and flow. Simulating the welding tool at the plunge, dwell and traverse stages allows a better understanding of the process and parameters. The paper by Mackenzie et al calculates transient temperature distributions and metal flow visualizations in the welding process.

Lifeboats launched from ships and offshore platforms must avoid overloading the occupants and vessel hull. A computational method using overlapping grids, to simplify the handling of lifeboat motion and specification of initial and boundary conditions, is used in the paper by Mørch et al to calculate vessel accelerations and pressures. The achieved accuracy in numerical simulations is comparable to the accuracy of experiments and provides a new design evaluation method.

Sanding systems are used to prevent a tram skidding on the rails, keeping sand used to a minimum.Simulating a sand-air mixture requires modelling the behaviour of the sand particles on the surface of the rails. A stochastic sub-model described in the paper by Möller et al, tuned using in-house experiment results, led to an improved design of the sanding device and sand jet which were later tested.

Water is inevitable in aircraft fuel tanks and aircraft movements create waves or “slosh” the fuel and water interface. Removing the water requires the positioning of scavenge pick-up locations to be optimised. The paper by Hylands et al uses CFD to simulate the dynamic motion of two liquids in a rectangular tank and compared to flow visualisation and pressure data results from a sloshing test rig.

Three of the papers mention the desire to make CFD the preferred method of analysis, the experimental approach is variously described as laborious, time-consuming, costly and requiring many optimisation tests. This is an old debate – “CFD replaces the wind tunnel” was mooted thirty years ago and we are still waiting! Most CFD practitioners realise that both are currently required for real engineering design - the challenge is to understand where each technique may augment the other.


Computational Fluid Dynamics Simulations of the Complex Geometry of a Technical Textile

K Farber, J Jasper, M Märtin, M Schmitt, S Krick, P Farber, J Leisen and HW Beckham

Multiphysics Models for Friction Stir Welding Simulation

D Mackenzie, H Liand R Hamilton

CFD-Supported Design of Lifeboats

HJ Mørch, M Perić,J Röper and E Schreck

Optimization of a Sanding System for a Tramway Car by Numerical Simulation of the Sand-Air Two-Phase Flow

S Möller, D Langmayr , G Brenn and P Krieg

Water-in-Fuel Sloshing for Aircraft Fuel Tanks

G Hylands, CA Toomer and JK-W Lam

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Editor- A. Green

Published - June 2013

Softback, 71 Pages

Submit your case study for the next issue of the journal. 

The Journal publishes CFD case study papers, i.e. investigations, simulations and validation exercises in accordance with CFD best practice guidelines. Original papers, book reviews and letters to the Editor are acceptable. 

The purpose of the Journal is to disseminate information to the wider NAFEMS community interested in the application of CFD for industrial design.
In the first instance, authors should contact the editor to propose the paper title and date for submission. 

All proposals and papers are peer reviewed by the editorial board. The editor reserves the right to edit any submitted paper before publication. When published, NAFEMS reserves the right to distribute any article in an electronic format including translation into languages other than English.

When a paper is submitted for publication, the author accepts that NAFEMS may publish the paper in any of its media channels, at any time, unless specific exclusions are specified at the outset. 

The format of the submitted paper should be MSWord with graphics and photographs as TIFF / JPEG files (300dpi).

Please send proposals and papers to: Dr A S Greenat