Exploring Flow Structures Around a Simplified ICE2 Train Subjected to a 30 Degree Side Wind Using LES

• Large-eddy simulation (LES) is conducted to investigate the flow around a simplified ICE2 trainunder side wind conditions at 30° yaw angle. The Reynolds number based on the height of the train and the freestream velocity is 200000. Two computations on two different meshes with different numbers of nodes are made tocheck the effect of the mesh resolution on the results. The fine and the coarse meshes give similar results meaningthat the results are mesh independent. The results are also verified against available experimental data. Goodagreement is obtained between the LES results and the experimental data. The LES results show that two flowregimes exist in the wake. The first flow regime consists of steady vortex lines in the upper part of the wake flow. Itchanges into unsteady shedding after a distance of about five train heights from their onset on the surface of thetrain. The second flow regime is the unsteady movement of the lower part of the wake vortices. They attach anddetach from the surface of the train in a regular fashion. The time-averaged flow and the instantaneous flow aroundthe ICE2 train at 30° yaw angle are explored.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Farkostteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Vehicle Engineering (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)

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