Pressure drag in linear and nonlinear quantum fluids
T. Winiecki, J. F. McCann, and C. S. Adams
TL;DR
This paper investigates how interactions in a Bose-Einstein condensate affect pressure drag around obstacles, revealing that interactions reduce drag via collisional screening, with implications for understanding quantum fluid dynamics.
Contribution
It provides a numerical analysis of pressure drag in quantum fluids, highlighting the impact of interactions and introducing the concept of collisional screening.
Findings
Interactions reduce pressure drag compared to ideal Bose gases
Vortex emission and bow wave formation observed
Collisional screening explains drag reduction
Abstract
We study the flow of a weakly-interacting Bose-Einstein condensate around an obstacle by numerical solution of the Gross-Pitaevskii equation. We observe vortex emission and the formation of bow waves leading to pressure drag. We compare the drag law with that of an ideal Bose gas, and show that interactions reduce the drag force. This reduction can be explained in terms of a `collisional screening' of the obstacle.
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