Forced underwater laminar flows with active magnetohydrodynamic metamaterials.

Area of Science:

• Fluid Dynamics
• Metamaterials Science
• Magnetohydrodynamics

Background:

• Existing propulsion systems often generate wakes, impacting efficiency and detectability.
• Active hydrodynamic metamaterials offer novel ways to control fluid flow.
• Magnetohydrodynamics (MHD) provides a mechanism to exert forces on conducting fluids.

Purpose of the Study:

• To advance active hydrodynamic metamaterials by introducing magnetohydrodynamic metamaterials.
• To design and theoretically validate wake-free propulsion systems using custom Lorentz force distributions.
• To investigate the feasibility of sustained laminar flow at high Reynolds numbers.

Main Methods:

• Development of magnetohydrodynamic metamaterials with tailored volumetric Lorentz force distributions.
• Application of multivariate optimization techniques to design force distributions for wake-free flows.
• Computational fluid dynamic (CFD) modeling to simulate and validate the proposed systems.
• Theoretical analysis of flow behavior across a range of Reynolds numbers (Re).

Main Results:

• Demonstrated theoretical and computational evidence for wake-free propulsion systems.
• Showcased the ability to sustain laminar flows at arbitrarily high Reynolds numbers.
• Identified that a fixed force distribution can maintain laminar flow across a broad Re range.
• Analyzed power requirements based on fluid conductivity.

Conclusions:

• Magnetohydrodynamic metamaterials offer a viable path towards efficient, wake-free propulsion.
• The proposed systems have significant implications for distributed propulsion in marine and space environments.
• The technology shows potential for robust performance across varying operational conditions.