# Dr Andrzej F Nowakowski

MSc, PhD, CEng, MIMechE

**Position**

Lecturer

**Administrative role**

Careers Director

**Address**

Department of Mechanical Engineering

Sir Frederick Mappin Building

Mappin Street

Sheffield

S1 3JD

UK

**Room**

RC10

**Telephone**

+44(0)114 2227812

**Fax**

+44(0)114 2227890

**Email**

a.f.nowakowski@sheffield.ac.uk

**URL**

www.shef.ac.uk/fluids/staff/afn

### Profile

Andrew joined the Group and the Department of Mechanical Engineering in April 2004 having previously spent five years as a post-doctoral Research Associate at UMIST (University of Manchester Institute of Science and Technology). He obtained his Ph.D. from Warsaw University of Technology, where he studied in the Department of Mechanical, Aeronautical and Power Engineering.

His research interests are in the general area of multi-component flows, multi-phase flows and aerodynamics. In all these categories the work aims to construct the algorithms for determining approximate solutions of relevant flow problems. Then, numerical methods are analysed and computer codes implementing algorithms are developed, first for the purpose of showing efficacy of the discretization methods and ultimately, to solve problems of practical interest. This is achieved by integrating the disciplines of applied mechanics, applied mathematics and computational science.

The most significant research outcome includes: The developed numerical technique within the framework of vortex method for recovering pressure and related quantities such as drag and lift for the flow past the rotating body. A novel approach for calculation of the flow problem in hydrocyclones and as consequence of this the finite element package for simulation of the three-dimensional flow in complex geometries. Most recently, a computational simulation of two-phase compressible flow has been proposed for safety analysis of chemical reactors. The approach taken in this research enables the resolution of multiphase mixtures and interface problems between compressible fluids.

All the projects necessitate close co-operation between participants from different universities and industry.

### Selected Journal Publications

- Michelitsch, T. M., Maugin, G. A., Nicolleau, F. C. G. A., Nowakowski, A. F., and Derogar, S. (2009). Dispersion relations and wave operators in self-similar quasicontinuous linear chains.

Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 80(1). - Michelitsch, T.M., Maugin, G.A., Nowakowski, A.F. and Nicolleau, F.C.G.A. (2009). Analysis of the vibrational mode spectrum of a linear chain with spatially exponential properties. International Journal of Engineering Science, 47(2), pp. 209-220
- Evans, W., Suksangpanomrung, A. and Nowakowski, A.F. (2008). The simulation of the flow within a hydrocyclone operating with an air core and with an inserted metal rod. Chemical Engineering Journal, 143, pp 51-61
- Doby, M.J., Nowakowski, A.F., Yiu, I. and Dyakowski, T. (2008). Understanding air core formation in hydrocyclones by studying pressure distribution as a function of viscosity. International Journal of Mineral Processing, Volume 86, Issues 1-4, pp. 18-25
- Librovich, B.V., Nowakowski, A.F. and Rovetta, A. (2007). A simplified chemical kinetics model for decomposition of Tigonox 21S. Chemical Engineering Journal, Volume 131, Issues 1-3, pp 113-121
- Doby, M.J., Nowakowski, A.F., Nowak, E. and Dyakowski, T. (2007). The numerical and experimental examination of swirl flow in a cylindrical container with rotating lids. Minerals Engineering, Volume 20, Issue 4, pp. 361-367.
- Kraipech, W., Chen, W., Dyakowski, T. and Nowakowski, A.F. (2006) The performance of the empirical models on industrial hydrocyclone design. International Journal of Mineral Processing, Volume 80, Issues 2-4, pp. 100-115.
- Doby, M.J., Kraipech, W. and Nowakowski, A.F. (2005). Numerical prediction of outlet velocity patterns in solid-liquid separators. Chemical Engineering Journal, Volume 111, Issues 2-3, pp. 173-180
- Kraipech, W., Nowakowski, A.F., Dyakowski, T. and Suksangpanomrung, A. (2005). An investigation of the effect of the particle-fluid and particle-particle interactions on the flow within a hydrocyclone. Chemical Engineering Journal, Volume 111, Issues 2-3, pp. 189-197.
- Dyakowski, T., Hale, J.M., Jaworski, A., White, N.M., Nowakowski, A.F., Meng, G., and Rwifa, S. (2005). Dual-modality probe for characterization of heterogeneous mixtures. IEEE Sensors Journal, Volume 5, Issue 2, pp. 134-138.
- Nowakowski, A.F., Cullivan, J.C., Williams, R.A. and Dyakowski, T. (2004). Application of CFD to modelling of the flow in hydrocyclones. Is this a realizable option or still a research challenge? Minerals Engineering, Volume 17, Issue 5, pp. 661-669
- Librovich, B.V. and Nowakowski, A.F. (2004). Analysis, design, and modelling of a rotary vane engine (RVE), Trans ASME: Journal of Mechanical Design, Volume 126, Issue 4, pp. 711-720
- Nowakowski, A.F. and Dyakowski, T. (2003). Investigation of swirling flow structure in hydrocyclones, Chemical Engineering Research and Design, Volume 81, Issue 8, pp. 862-873.
- Nowakowski, A.F., Kraipech, W. and Dyakowski, T. (2003). Performance of some finite elements in numerical simulation of complex incompressible three dimensional flow, in Analysis and simulation of multifield problems, Wendland, W.L. and Efendiew, M. (ed.) Lectures Notes in Applied and Computational Mechanics, Volume 12, pp. 154-163.
- Protas, B., Styczek, A. and Nowakowski, A.F. (2000). An effective approach to computation of forces in viscous incompressible flows, Journal of Computational Physics, Volume 159, Issue 2, pp. 231-245.
- Nowakowski, A.F., Kraipech, W., Williams, R.A. and Dyakowski, T. (2000). The hydrodynamics of a hydrocyclone based on a three-dimensional multi-continuum model, Chemical Engineering Journal, Volume 80, Issue 1-3, pp. 275-282
- Protas, B., Nowakowski, A.F. and Goujon-Durand, S. (1998). Influence of the obstacle geometry on the dynamical properties of the von Karman vortex street, Journal of Applied Mathematics and Mechanics (ZAMM), Volume 78, Issue 2, pp. 675-676.
- Nowakowski, A.F., Rokicki, J. and Styczek, A. (1996). The pressure problem in the stochastic vortex blob method, The European Series in Applied and Industrial Mathematics, Volume 1, pp. 125-134.
- Rokicki, J., Floryan, J.M. and Nowakowski, A.F. (1996). Domain decomposition for the Navier-Stokes equation in complex geometries, Journal of Applied Mathematics and Mechanics (ZAMM), Volume 76, Issue 5, pp. 431-432.