Stillingstittel:
Postdoctoral fellowship in Fluid Dynamics: Wave Current Interactions

Stillingsbeskrivelse:

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Jobbnorge ID: 122695

A postdoctoral fellowship position is available at the Department of Energy and Process Engineering, in the Fluid Mechanics division. The appointment has a duration of 3 years. The position is financed by the Research Council of Norway.

 

Within the field of theoretical hydrodynamics the candidate will be focussing on the physics of surface waves in the presence of sub-surface currents. The skills required are either from analytical physics/mathematics or from computation of free-surface flow, as detailed below.

 

The group of Dr. Ellingsen works primarily with analytical methods and approximation procedures for the description of waves interacting with currents of different shear profiles. Wave-current interactions are of technological importance in many branches of marine hydrodynamics and oceanographics, such as for ship and vessels, sea loads on marine structures, coastal erosion and sediment transport, and (of particular interest to our group) is a primary candidate mechanism for the formation of giant waves. Hence, although of fundamental nature, results obtained are of immediate applicability to important real world challenges.

 

It is desirable to develop a computational capacity in the research group for comparison with analytical and semi-analytical results. It is necessary if so to find a candidate with a highly relevant background, who can work independently and quickly produce high quality computation of non-linear surface wave flow with sub-surface shear current. Since a candidate with this highly specialised qualification may not be forthcoming, the postdoc position can alternatively be geared towards the ongoing analytical work of the group, in which case a strong background in physics or applied mathematics will be requisite.

 

A candidate is sought with one of the two following sets of specialised skills (there is no initial preference for one over the other).

 

A) extensive experience with numerical calculation of fluid dynamics of nonlinear surface waves, including fully non-linear motion of the free surface. In application the candidate must in this case explain how her/his known methods can be applied to including the presence of a sub-surface shear current and (if applicable) be extended to 3D, noting that potential flow methods will not be applicable; for example how fully non-linear waves could be calculated for the flow described in J.Fluid Mech. 742 R2 (2014) (http://arxiv.org/abs/1401.1682). The specific challenges of the very specialised task means that general engineering CFD experience (with or without free surface) based on commercial software will not be sufficient.

 

B) extensive research experience with focus on analytical methods within physics or applied mathematics, preferably but not necessarily fluid mechanics and the physics of surface waves. The primary research will be analytical, in particular the development of analytical and semi-analytical models for wave-current calculations in the presence of shear current, supported where necessary by numerical calculation. Some specific questions that the research group will be working on are non-linear extensions to existing linear wave theory for wave-current systems, the onset of modulational instability, approximate methods for waves on general shear profiles, stratified density flows, and the role of critical layers.

 

For further information about the position, contact Associate Professor Simen Å. Ellingsen (simen.a.ellingsen (at) ntnu.no).

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Minstelønn: 0

Maksimal lønn: 0

Arbeidsgiver Navn: NTNU - Norges teknisk-naturvitenskapelig

Arbeidsgiver adresse: 7491 TRONDHEIM

Job kort beskrivelse: University and higher education teachers

Land: Norge

Region: Sør-Trøndelag

Kilde til jobbtilbud: NAV, Offentlige arbeidsformidlinger, Norge

Lønn valuta: NOK

Lønn periode: Pr. år