| 1. |
- Caraeni, D., et al.
(författare)
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Compact third-order multidimensional upwind discretization for steady and unsteady flow simulations
- 2005
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Ingår i: Computers & Fluids. - : Elsevier BV. - 0045-7930 .- 1879-0747. ; 34:05-apr, s. 419-441
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Tidskriftsartikel (refereegranskat)abstract
- We propose a new third-order multidimensional upwind algorithm for the solution of the flow equations on tetrahedral cells unstructured grids. This algorithm has a compact stencil (cell-based computations) and uses a finite element idea when computing the residual over the cell to achieve its third-order (spatial) accuracy. The construction of the new scheme is presented. The asymptotic accuracy for steady or unsteady, inviscid or viscous flow situations is proved using numerical experiments. The new high-order discretization proves to have excellent parallel scalability. Our studies show the advantages of the new compact third-order scheme when compared with the classical second-order multidimensional upwind schemes.
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| 2. |
- Caraeni, D., et al.
(författare)
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LES of spray in compressible flows on unstructured grids
- 1999
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Ingår i: 30th Fluid Dynamics Conference. - 9780000000002
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Konferensbidrag (refereegranskat)abstract
- In this paper we report some results of our numerical simulations of sprays in compressible flows using Large Eddy Simulation. The combined LES- and spray code has been applied to the computation of the flow and spray injection into a swirl generator of a gas-turbine. The interaction between the spray jet and the flow field has been investigated. A dynamic SGS model has been used and results have been compared with the experimental data.
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| 3. |
- Caraeni, D., et al.
(författare)
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Modeling of liquid fuel injection, evaporation and mixing in a gas turbine burner using large eddy simulations
- 2000
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Ingår i: Flow Turbulence and Combustion. - 1386-6184 .- 1573-1987. ; 65:2, s. 223-244
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Tidskriftsartikel (refereegranskat)abstract
- The interaction of turbulence, temperature fluctuation, liquid fuel transport, mixing and evaporation is studied by using Large Eddy Simulations (LES). To assess the accuracy of the different components of the methods we consider first isothermal, single phase flow in a straight duct. The results using different numerical methods incorporating dynamic Sub-Grid-Scale (SGS) models are compared with DNS and experimental data. The effects of the interactions among turbulence, temperature fluctuation, spray transport, evaporation and mixing of the gaseous fuel are studied by using different assumptions on the temperature field. It has been found that there are strong non-linear interactions among temperature-fluctuation, evaporation and turbulent mixing which require additional modeling if not full LES is used. The developed models and methods have been applied to a gas turbine burner into which liquid fuel is injected. The dispersion of the droplets in the burner is described.
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| 4. |
- Conway, S., et al.
(författare)
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Large eddy simulation of the flow through the blades of a swirl generator
- 2000
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Ingår i: International Journal of Heat and Fluid Flow. - 0142-727X .- 1879-2278. ; 21:5, s. 664-673
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Tidskriftsartikel (refereegranskat)abstract
- Subsonic turbulent flow between the blades of a swirl generator is considered using large eddy simulations (LES). The boundary layer exhibits transition in the upstream parts of the blade. Further downstream, the Row separates both on the suction and the pressure surfaces. In the boundary layer, one may note the streaky vortices. In addition, due to the blade surface curvature large, time-dependent streamwise vortices are formed. The wake of the blades also contains large scale, time-dependent structures. These phenomena are captured directly by LES. In our study, we use two different subgrid scale (SGS) models: the first model is an implicit model and the second is a novel dynamic model dubbed the dynamic divergence model (DDM). The effects of the SGS model and the grid resolution are also investigated.
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