## About Professor Steven Armfield

**My research interests cover the areas of the analysis and development of Navier-Stokes solvers, direct and large eddy simulation, turbulence modelling, natural convection flow, stratified flow, jets, fountains and plumes.**

My work on natural convection boundary layers has made a substantial contribution to the understanding of the mechanism of flow initiation and transition. I carried out the first simulation of open stratified cavity flow, allowing the basic bifurcation mechanism to be isolated and also carried out the first investigation of weak fountain flow, leading to new scaling formulae describing the basic structure of weak fountain flow based on control parameters. I, and co-workers, recently developed a new multi-scale large eddy simulation model for breaking waves. I have contributed to the development of non-staggered Navier-Stokes solvers, resolving a long standing problem on the use of non-staggered grids with finite volume schemes. More recently, I carried out the first detailed comparative analysis of the efficiency and accuracy of iterative and non iterative projection methods. I have worked on parallel coding for a number of years, developing an HPF coded parallel Navier-Stokes solver running on a switched workstation network, and carried out a comparative evaluation with PVM and MPI coded solvers.

### Selected publications

- Armfield, S. W. & Street, R. 2002 An analysis and comparison of the time accuracy of fractional-step methods for the Navier--Stokes equations on staggered grids. Intl J. Num. Meth. Fluids 38, 255--282.
- Lin, W. & Armfield, S. W. 1999 Direct simulation of natural convection cooling in a vertical circular cylinder. Intl J. Heat Mass Transfer 42, 4117--4130.
- Armfield, S. W. & Street, R. 1999 The fractional step method for the Navier--Stokes equations on staggered grids: the accuracy of three variations. J. Comput. Phys. 153, 660--665.
- Cheng L, Armfield S, 1995, a simplified marker and cell method for unsteady flows on non-staggered grids, Intl J. Num. Meth. Fluids 38, 21, 15--34.
- Armfield, S. W. 1994 Ellipticity, accuracy and convergence of the discrete Navier--Stokes equations. J. Comput. Phys. 114, 176--184.
- Armfield, S. W. & Debler, W. 1993 Purging of density stabilized basins. Intl J. Heat Mass Transfer 36, 519--530.
- Armfield, S. W. & Patterson, J. C. 1992 Wave properties of natural convection boundary layers. J. Fluid Mech. 239, 195--211.
- Armfield, S. W. 1991 Finite-difference solutions of the Navier-Stokes equations on staggered and non-staggered grids. Computers & Fluids 20, 1--17.
- Armfield, S. W. & Patterson, J. C. 1991 Direct simulation of wave interactions in natural convection in a cavity. Intl J. Heat Mass Transfer 34, 929--940.
- Patterson, J. C. & Armfield, S. W. 1990 Transient features of natural convection in a cavity. J. Fluid Mech. 219, 469--497.