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Visar resultat 1 - 5 av 60 avhandlingar som matchar ovanstående sökkriterier.
1. Robust Numerical Wall Functions Implemented in OpenFOAM
Sammanfattning : This thesis presents two new numerical wall models for computing Reynolds-Averaged-Navier-Stokes (RANS) equations with low-Reynolds-number turbulence models. Theobjective is to considerably reduce the total central processing unit (CPU) cost of thenumerical simulations of wall bounded flows while maintaining the accuracy of anylow-Reynolds-number turbulence model. LÄS MER
2. Modeling of Diesel Fuel Spray Formation and Combustion in OpenFOAM
Sammanfattning : The formation, ignition, and combustion of fuel sprays are highly complex processes and the available models have various shortcomings. The development and application of multidimensional CFD models, that describe the different phenomena have rapidly increased through the use of commercial and public software (e.g. LÄS MER
3. LES stochastic modelling of cavitation with its applications in OpenFOAM
Sammanfattning : Cavitation is a vaporisation process that commonly happens in high pressure injectornozzles nowadays. It has been shown by previous studies that cavitationhas a significant influence on the subsequent atomization process, the qualityof which would in turn heavily affect the quality of combustion. LÄS MER
4. LES stochastic modelling of cavitation with its applications in OpenFOAM
Sammanfattning : Cavitation is a vaporization process that commonly happens in high-pressure injector nozzles nowadays. It has been shown by previous studies that cavitation has a significant influence on the subsequent atomization process, the quality of which would in turn heavily affect the process of combustion. LÄS MER
5. Extension of OpenFOAM Library for RANS Simulation of Premixed Turbulent Combustion
Sammanfattning : Unsteady multi-dimensional numerical simulation of turbulent flames is a well recognized tool for research and development of future internal combustion engines capable for satisfying stringent requirements for ultra-low emission and highly efficient energy conversion. To attain success, such simulations need, in particular, well elaborated Computational Fluid Dynamics (CFD) software, as well as advanced predictive models of turbulent burning. LÄS MER