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Klimarelevant forskning

In this project we have applied and further developed our Large Eddy Scale (LES) and RANS ocean models to predict the resulting wave-current-wind flow from the free surface to the bottom. We have now completed an LES model for the wave-current flow from the free surface to the bottom which have been tested on different surface flows, including combined waves and current flows. Furthermore we have obtained results for combined wind and tidally driven flows using our RANS model. A substantial work on drift mechanisms of the flow near the bottom on the ocean, visualising both the wave-current induced drift and the resulting sediment transport, has been undertaken. Results are presented in peer reviewed well reputed international journals and on well recognized international conferences.

We propose to apply and further develop our two existing Large Eddy Scale (LES) ocean models to predict the air-sea interaction and the resulting wave-current flow from the free surface to the bottom. This includes the entire dynamics of the wind above th e waves, the free surface, as well as in the entire water column from the free surface to the bottom; these flows are mutual dependent. We propose to study the resulting shear stress and turbulence exchange mechanisms between the ocean and the atmosphere  (relevant to climate research) as well as transport mechanisms both in the near ocean surface wind boundary layer above the waves, and in the ocean flow from the free surface to the bottom. We intend to utilize these results to improve large-scale storm s urge and meteorological models in collaboration with the group of Peter Nielsen at Queensland University. Since our models are capable of calculating the three-dimensional turbulent structures; this facilitates prediction of flow phenomena which can not b e predicted with present models. Finally we propose to apply our models to improve existing wave-current models valid for the entire water column, taking wind into account. It is important to notice that the free surface forms part of the solution in this  project.

Air-Sea Interaction and Transport Mechanisms in the Ocean

We propose to apply and further develop two existing Large Eddy Scale (LES) ocean models and an existing k-e ocean model capable of calculating the three-dimensional turbulent ocean flow from the bottom to the free surface, where the latter forms part of the solution. The LES solvers will also be capable of resolving the large three-dimensional turbulent structures in the ocean; this facilitates prediction of flow phenomena which can not be predicted with present models. The k-e code is suited for large s cale applications, where LES models are more likely to yield poor results because the large turbulent structures can not be resolved. Thus the k-e and LES models are complementary. With these models we propose to study the wave-current interaction, and th e interaction between the free surface and the bottom in shallow and intermediate waters. We then propose to investigate the sediment dynamics and plankton dynamics in the ocean using these models in conjunction with a sediment model and a plankton model.

Transport mechanisms in the ocean

The project aims to develop and apply a Large Eddy Scale ocean model capable of calculating the three-dimensional turbulent ocean flow from the bottom to the free surface, where the latter forms part of the solution. Such a solver will be able to resolve the large three-dimensional turbulent structures in the ocean. This facilitates predictions of flow phenomena which can not be predicted with present models. The project will study the wave-current interaction in the ocean with this model. Of particular i nterest is the interaction between the free surface and the flow deeper in the water column. This model also facilitates a study of e.g. wave-wave interactions in the sea with a current present.

Wave-Current Interactions and Transport Mechanisms in the Ocean

The purpose is to strengthen the relations between the National Maritime Research Institute (NMRI), Japan, and Department of Marine Technology, NTNU, by the proposed collaborative research on abnormal waves. The goal for the research project is to establi sh a model describing abnormal (rogue) waves valid for random ocean waves on shear flows. The project is divided into two tasks:
1. The propagation of ocean waves on shear flows will be considered. This is a theoretical study applying an asymptotic pertur bation method (WKB) on linear and non-linear regular ocean waves.
2. This method will be extended to stochastic processes valid for random ocean waves on shear flows.
The proposed project will add to the understanding of the mechanisms concerning the gene ration of rogue waves. Moreover, the results may ultimately represent a useful tool for giving better estimates of wave loads and wave impacts of high waves on marine structures.

Abnormal waves

4 projects

FRINATEK-Fri prosjektstøtte for matematikk, naturvitenskap og teknologi

Air-Sea Interaction and Transport Mechanisms in the Ocean

Awarded: NOK 8.5 mill.

Project Period: 2013-2016

Location: Trøndelag - Trööndelage

FRINATEK-Fri prosjektstøtte for matematikk, naturvitenskap og teknologi

Transport mechanisms in the ocean

Awarded: NOK 7.5 mill.

Project Period: 2008-2012

Location: Trøndelag - Trööndelage

FRITEK-Teknologi

Wave-Current Interactions and Transport Mechanisms in the Ocean

Awarded: NOK 2.3 mill.

Project Period: 2005-2008

Location: Trøndelag - Trööndelage

F-GEO-Naturvitenskap, geofag

Abnormal waves

Awarded: NOK 40,000

Project Period: 2004-2005

Location: Trøndelag - Trööndelage