Applications of CFD 2008 Neil W. Bressloff N. W. Bressloff COMPUTATIONAL ENGINEERING AND DESIGN GROUP

Introduction (fundamental CFD) N. W. Bressloff

Introduction (aerospace design CFD) N. W. Bressloff Nacelle intake Winglets Flap track fairings Wing fuselage fairing

Introduction (haemodynamics) N. W. Bressloff

Introduction (CAD – mesh – analysis) N. W. Bressloff

Introduction (CFD DSO strategy) N. W. Bressloff RSM Construct RSM Evaluate Search Using RSM Best Design Adequate ? RSM Tuning Build Data-Base CFD DoE Initial Geometry … Cluster Parallel Analysis

Aerospace design CFD (flap track fairing design) N. W. Bressloff

Aerospace design CFD (response surface evolution) N. W. Bressloff Geometry parameterization NO r2 converged? Construct RSM Reduce domain Objective function converged? Build data-base DoE CFD … Search RSM Construct EI surface Search for optima RSM Adequate? Construct & search RSM Optimum design UPDATE STRATEGY (skip if no updates) YES Update at optima Update at optimum Part converged CFD Forrester, A. I. J., Bressloff, N. W. and Keane, A. J., 2006, Computational Design Methods, United States Patent 7092845.

Aerospace design CFD (wing design) N. W. Bressloff Forrester, A. I. J., Bressloff, N. W. and Keane, A. J., 2006, Optimisation using Surrogate Models and Partially Converged Computational Fluid Dynamics Simulations, R. Soc. Proc. A. 462 pp. 2177-2204

Aerospace design CFD N. W. Bressloff

Aerospace design CFD (validation) N. W. Bressloff Potential flow solver VGK Uses empirical data + calculation No turbulence modelling Easily able to compute airfoil pressure profiles 1 analysis ~ 2 seconds RANS analysis using Fluent Structured BL mesh Unstructured external mesh Total ~ 18000 mesh elements Spalart Allmaras turbulence model 1 analysis ~ 5 minutes

Aerospace design CFD (advanced search strategy) N. W. Bressloff Analysis + Optimization method CFD GEOMETRY Parameterized model Initial design variables Optimum design Design variables Iteration (geometry parameters) Analysis + Optimization method CFD GEOMETRY To give required Cp profile Initial design variables Cp PROFILE Parameterized model Design variables Iteration (Cp parameters) Optimum design Inverse Design Barrett, T. R., Bressloff, N. W. and Keane, A. J., 2006, Airfoil Shape Design and Optimization Using Multi-Fidelity Analysis and Embedded Inverse Design, AIAA J., 44, 9, 2051-2060.

Aerospace design CFD (lean burn injector) N. W. Bressloff

Haemodynamics (background) N. W. Bressloff

Haemodynamics (anatomy/geometry) N. W. Bressloff

Haemodynamics How can this work be adapted for a four hour case study? N. W. Bressloff How can this work be adapted for a four hour case study? Bressloff, N. W., 2007, Parametric shape exploration in the carotid artery bifurcation, to appear, J. Biomech., 40, 2483-2491.

N. W. Bressloff Bhaskar, K. V., Bressloff, N. W., Nair, P. B. and Shearman, C. P., 2007, Predictive haemodynamics in a one-dimensional human carotid artery bifurcation. Part I: Application to stent design, IEEE Trans. Biom. Eng., 54, 5, 802-812.

Haemodynamics (parametric geometry definition) N. W. Bressloff Automated design Parametric geometry Design table Parameter selection Surrogate models DoEs Regression vs interpolation Exploration vs exploitation

Haemodynamics (shape variation) N. W. Bressloff

Haemodynamics (analysis) N. W. Bressloff

Haemodynamics (From the heart to the brain) N. W. Bressloff

From the heart to the brain: carotid inlet profile N. W. Bressloff