Multi-Scale Modeling of Wind-Wave Interaction in the Presence of Offshore Structures for Renewable Energy Applications

We develop a multi-scale modeling capability for the simulation of wind and wave coupling dynamics, with a focus on providing environmental input for wind and wave loads on offshore structures. For the large-scale wind–wave environment, large-eddy simulation for the wind turbulence and high-order spectral simulation for the nonlinear ocean waves are dynamically coupled. For the local-scale air and water flows past the structure, we use a hybrid interface capturing and immersed boundary method. Coupled level-set/volume-of-fluid/ghost-fluid method is used to capture the wave surface. Immersed boundary method is used to represent the structure. The large-scale wind–wave simulation provides inflow boundary conditions for the local-scale air–water–structure simulation. Our simulation captures the dynamic evolution of ocean nonlinear wavefield under the wind action. The wind field is found to be strongly coupled with the surface waves and the wind load on a surface-piercing object is largely wave-phase dependent.

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Multi-Scale Modeling for LES of Engineering Designs of Large-Scale Combustors

42nd AIAA Aerospace Sciences Meeting and Exhibit ◽

10.2514/6.2004-157 ◽

2004 ◽

Cited By ~ 13

Author(s):

Suresh Menon

Keyword(s):

Large Scale ◽

Multi Scale ◽

Scale Modeling ◽

Engineering Designs ◽

Multi Scale Modeling

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Multi-scale Modeling of Radiation Damage: Large Scale Data Analysis

Journal of Physics Conference Series ◽

10.1088/1742-6596/759/1/012078 ◽

2016 ◽

Vol 759 ◽

pp. 012078 ◽

Cited By ~ 1

Author(s):

M Warrier ◽

U Bhardwaj ◽

S Bukkuru

Keyword(s):

Data Analysis ◽

Radiation Damage ◽

Large Scale ◽

Multi Scale ◽

Large Scale Data ◽

Scale Modeling ◽

Multi Scale Modeling ◽

Scale Data

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A Highly Scalable Sharp-Interface Immersed Boundary Method for Large-Scale Parallel Computers

23rd AIAA Computational Fluid Dynamics Conference ◽

10.2514/6.2017-3622 ◽

2017 ◽

Cited By ~ 4

Author(s):

Chi Zhu ◽

Jung Hee Seo ◽

Vijay Vedula ◽

Rajat Mittal

Keyword(s):

Immersed Boundary Method ◽

Large Scale ◽

Parallel Computers ◽

Sharp Interface ◽

Immersed Boundary ◽

Boundary Method

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Advanced Steel Design by Multi-Scale Modeling

Materials Science Forum ◽

10.4028/www.scientific.net/msf.654-656.41 ◽

2010 ◽

Vol 654-656 ◽

pp. 41-46 ◽

Cited By ~ 1

Author(s):

Bruno C. De Cooman ◽

H.K.D.H. Bhadeshia ◽

Frédéric Barlat

Keyword(s):

Large Scale ◽

Lattice Stability ◽

Scale Production ◽

Critical Material ◽

Present Contribution ◽

Reliable Determination ◽

Multi Scale ◽

Scale Modeling ◽

Multi Scale Modeling ◽

Steel Design

The present contribution highlights the approach to multi-scale steel design used at the Graduate Institute of Ferrous Technology (GIFT). Multi-scale modeling combining ab-initio methods, molecular dynamics, crystal plasticity modeling etc. enables GIFT researchers to gain a better fundamental understanding of phase and lattice stability, magnetic properties and basic mechanical constants. In addition, these methods allow for the reliable determination of critical material parameters. The opportunities for the development of new steel grade is thereby greatly enhanced and, when these new materials-oriented methods are combined with the more traditional engineering modeling methods, the challenges related to the large scale production of new steel grades can also be addressed.

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Implementation of an Infinite-Height Levee in CaFunwave Using an Immersed-Boundary Method

Journal of Fluids Engineering ◽

10.1115/1.4033490 ◽

2016 ◽

Vol 138 (11) ◽

Author(s):

Adam Oler ◽

Ning Zhang ◽

Steven R. Brandt ◽

Qin Chen

Keyword(s):

Immersed Boundary Method ◽

Large Scale ◽

Shallow Water Equation ◽

Immersed Boundary ◽

Boundary Method ◽

Virtual Force ◽

Direct Forcing ◽

Infinite Height ◽

Grid Points ◽

Complicated Geometries

Numerical simulations of storm-surge–wave actions on coastal highways and levees are very important research topics for coastal engineering. In a large-scale region hydrodynamic model, highways and levees are often complicated in geometry and much smaller in size compared to the grid spacing. The immersed-boundary method (IBM) allows for those complicated geometries to be modeled in a less expensive way. It can allow very small geometries to be modeled in a large-scale simulation, without requiring them to be explicitly on the grid. It can also allow for complicated geometries not collocated on the grid points. CaFunwave is a project that uses the Cactus Framework for modeling a solitary coastal wave impinging on a coastline and is the wave solver in this research. The IBM allows for a levee with different geometries to be implemented on a simple Cartesian grid in the CaFunwave package. The IBM has not been often used previously for these types of applications. Implementing an infinite-height levee using the IBM into the Cactus project CaFunwave involves introducing immersed-boundary (IB) forcing terms into the standard two-dimensional (2D) depth-averaged shallow water equation set. These forcing terms cause the 2D solitary wave to experience a virtual force at the grid points surrounding the IB levee. In this paper, the levee was implemented and tested using two different IBMs. The first method was a feedback-forcing method, which proved to be more effective at modeling the levee than the second method, the direct-forcing method. In this study, the results of the two methods are presented and discussed. The effect of levee shape on the flow is also investigated and discussed in this paper.

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Implementation of Infinite Height Levee in CaFunwave Using an Immersed Boundary Method

Volume 2: Fora ◽

10.1115/ajkfluids2015-34068 ◽

2015 ◽

Author(s):

Adam M. Oler ◽

Ning Zhang ◽

Steven R. Brandt

Keyword(s):

Immersed Boundary Method ◽

Large Scale ◽

Shallow Water Equation ◽

Immersed Boundary ◽

Immersed Boundary Methods ◽

Boundary Method ◽

Shape Effects ◽

Infinite Height ◽

Grid Points ◽

Complicated Geometries

Numerical simulations of storm-surge-wave actions on coastal highways and levees are very important research topics for coastal Louisiana. In a large scale region hydrodynamic model, highways and levees are often complicated in geometry and much smaller in size compared to the grid size. The immersed boundary method (IBM) allows for those complicated geometries to be modeled in a less expensive way. It can allow very small geometries to be modeled in a large scale simulation, without requiring them to be explicitly on the grid. It can also allow for complicated geometries not collocated on the grid points. CaFunwave is a project that uses the Cactus Framework for modeling a solitary coastal wave impinging on a coastline, and is the wave solver in this research. The IBM allows for a levee with different geometries to be implemented on a simple Cartesian grid in the CaFunwave package. The IBM has not been used previously for this type of application. Implementing an infinite height levee using the IBM in the Cactus CaFunwave code involves introducing IB forcing terms into the standard 2-D depth averaged shallow water equation set. These forcing terms cause the 2-D solitary wave to experience a virtual force at the grid points surrounding the immersed boundary levee. In this paper the levee was implemented and tested using two different immersed boundary methods. The first method was a feedback-force method, which proved to be more effective at modeling the levee than the second method, the direct-forcing method. In this study, the results of the two methods, as well as the shape effects on the flow, are presented and discussed.

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