Forced underwater laminar flows with active magnetohydrodynamic metamaterials

Dean Culver, Yaroslav Urzhumov
2017 Physical review. E  
Theory and practical implementations for wake-free propulsion systems are proposed and proven with CFD modeling. Introduced earlier, the concept of active hydrodynamic metamaterials is advanced by introducing magnetohydrodynamic (MHD) metamaterials, structures with customdesigned volumetric distribution of Lorentz forces acting upon a conducting fluid. Distributions of volume forces leading to wake-free, laminar flows are designed using multivariate optimization. Theoretical indications are
more » ... indications are presented that such flows can be sustained at arbitrarily high Reynolds numbers. Moreover, it is shown that in the limit Re 10 2 , a fixed volume force distribution may lead to a forced laminar flow across a wide range of Re numbers, without the need to reconfigure the force-generating metamaterial. Power requirements for such a device are studied as a function of the fluid conductivity. Implications to the design of distributed propulsion systems underwater and in space are discussed. 2
doi:10.1103/physreve.96.063107 pmid:29347398 fatcat:cywdxpalyjh67brupcvydwy26u