Tag: Computational Mechanics
Patch bubbles improve residual-free bubble methods for advection-dominated problems
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in EngineeringWhat the study found The authors present a new variant of the residual-free bubble method for advection-dominated problems. They report that adding patch bubbles gives the bubble space more flexibility and that numerical experiments show the method performs better than the standard residual-free bubble method. Why the authors say this matters The study suggests this…
Vertical vibration changes regolith flow but lowers average discharge rate
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in EngineeringWhat the study found Vertical vibrations changed how lunar regolith simulant moved through a hopper, making the flow more regular and reducing clogging, but the average mass flow rate stayed lower than in purely gravitational flow. Why the authors say this matters The authors state that hoppers are expected to be essential for handling lunar…
Fourier analysis identified flow-regime changes in dense granular rheology
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in EngineeringWhat the study found Fourier transform rheology was used to identify rheological markers in dense granular flows, including viscoelastic crossovers at relatively low shear rates and secondary loops at higher shear rates. The authors report that these patterns are consistent with a transition from quasistatic, friction-like flow to dense inertial, fluid-like flow. Why the authors…
Beverloo law mispredicts soft-particle silo flows at different sizes
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in EngineeringWhat the study found The study found that the Beverloo equation does not match all of the simulated flow rates of soft particles through a vertical silo: it underpredicts the flow rate for small outlet sizes and overpredicts it for large outlet sizes. Why the authors say this matters The authors say the divergence from…
Microgravity lowers the jamming point of granular materials
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in EngineeringWhat the study found Granular materials jam at a lower packing density in microgravity than on Earth. The study also found that, in microgravity, cohesive interparticle forces increase the stress needed for granular media to flow. Why the authors say this matters The authors say understanding granular behavior in low gravity is crucial for planetary…
Froude scaling collapses granular impact trajectories across gravity
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in EngineeringWhat the study found The study found that impact behavior into cohesionless granular media can remain qualitatively similar across different gravitational conditions when initial velocities are scaled using the Froude number, a dimensionless quantity that relates speed, gravity, and length scale. Why the authors say this matters The authors suggest this points to an underlying…
Vibration effects on lunar regolith simulants depend on particle size and direction
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in EngineeringWhat the study found The simulants showed different convective behavior depending on particle size and whether vibrations were vertical or horizontal. Vertical vibrations strengthened convective motion as average particle size increased, while horizontal vibrations generally produced stronger convection as average particle size decreased. Why the authors say this matters The study suggests this matters because…
