A5060806233- Cavitation Phenomena in Pumps
- Fluid Dynamics Simulations and Interactions
- Ship Hydrodynamics and Maneuverability
- Hydraulic and Pneumatic Systems
- Fluid Dynamics and Turbulent Flows
- Computational Fluid Dynamics and Aerodynamics
- Fluid Dynamics and Vibration Analysis
- Water Systems and Optimization
- Maritime Transport Emissions and Efficiency
- Fluid Dynamics and Heat Transfer
- Aerodynamics and Fluid Dynamics Research
- Spacecraft and Cryogenic Technologies
- Wind and Air Flow Studies
- Advanced Multi-Objective Optimization Algorithms
- Rocket and propulsion systems research
- Aerosol Filtration and Electrostatic Precipitation
- Hydraulic flow and structures
- Aerodynamics and Acoustics in Jet Flows
- Cyclone Separators and Fluid Dynamics
- Ultrasound and Cavitation Phenomena
- Advanced Numerical Methods in Computational Mathematics
- Aerospace Engineering and Energy Systems
- Oil and Gas Production Techniques
- Flow Measurement and Analysis
- Nuclear Engineering Thermal-Hydraulics
Chalmers University of Technology
2016-2025
Norsk Hydro (Sweden)
2020
École Polytechnique Fédérale de Lausanne
2018
We describe an approach to simulate dynamic cavitation behavior based on large eddy simulation of the governing flow, using implicit for subgrid terms together with a wall model and single fluid, two-phase mixture description combined finite rate mass transfer model. The pressure-velocity coupling is handled PISO algorithm modified pressure equation improved stability when are active. computational first applied propeller flow in homogeneous inflow both wetted cavitating conditions then...
Abstract
In this paper, the performance of three different numerical approaches in cavitation modelling are compared by studying two benchmark test cases to understand capabilities and limitations each method. Two methods well established compressible thermodynamic equilibrium mixture model incompressible transport equation finite mass transfer model, which with a third method, recently developed Lagrangian discrete bubble model. continuum flow field is treated similar approach, however cavities...
There is a large body of research available focusing on how ship hull conditions, including various coatings, coating defects, and biofouling, influence the boundary layer, hence resistance wake field ship. Despite this there seems to be little consensus or established best practice within design community model roughness for ship-scale CFD. This study reviews compares proposed methods roughness, support its use in community. The impact types additional fields are computed presented...
The application of artificial roughness to mitigate tip vortex cavitation inception is analyzed through numerical and experimental investigations carried out on an elliptical foil. Different configurations sizes are tested, effects inception, drag, lift studied. Implicit Large Eddy Simulation employed conduct the simulation a proper grid resolution having spatial as fine 0.062 mm. Two different approaches including using rough wall function resolving flow around elements evaluated. New...
The flow around an axisymmetric hull, with and without appendages, is investigated using large eddy simulation (LES), detached (DES), Reynolds averaged Navier Stokes (RANS) models. main objectives of the study to investigate effect different methods demonstrate feasibility DES LES on relatively coarse grids for submarine flows, but also discuss some generic features hydrodynamics. For this purpose DARPA Suboff configurations AFF1 (bare hull) AFF8 (fully appended model) are used. case...
In this paper, a numerical method to assess the risk of cavitation erosion is proposed, which can be applied incompressible simulation approaches. The based on energy description erosion, considers an transfer between collapsing cavities and eroded surface. proposed framework provides two improvements compared with other published methods. First, it kinetic in surrounding liquid during collapse instead potential cavities, avoids uncertainty regarding calculation driving pressure equation....
Wind-powered ship propulsion (WPSP) is the concept where wind main source of thrust, while traditional system operates when needed. This type can lead to considerably reduced emissions, something that shipping community striving for. A well-known example WPSP Oceanbird with goal cut emissions up 90%. In this study, propeller design process for a wind-powered car-carrier (wPCC) such as investigated, what various challenges are and therefore how an automated optimisation procedure should be...
A reformulation of the large eddy simulation (LES) equations is presented, based on an alternative decomposition subgrid stress tensor leading to modified Leonard, cross, and Reynolds terms, which are all individually frame indifferent. The new Leonard tensor, identical scale similarity model proposed by Bardina et al(J. Bardina, J. H. Ferziger W. C. Reynolds, 1980, AIAA Paper 80-1357), computable thus becomes integral part LES equations, so this formulation clearly emphasizes difference...
Abstract. In this paper, a methodology is presented for modelling underwater noise emissions from ships based on realistic vessel activity in the Baltic Sea region. This paper combines Wittekind source model with Ship Traffic Emission Assessment Model (STEAM) order to produce regular updates ships. approach allows construction of maps, but requires parameters which are not commonly available commercial ship technical databases. For reason, alternative methods were necessary fill required...