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Coupling of Coastal Wave Transformation and Computational Fluid Dynamics Models for Seakeeping Analysis

This research focused on depth-integrated modeling of coastal wave and surf-zone processes in support of computational fluid dynamics (CFD) simulation of ship motions. There were two components of the project. The first was the development of a numerical dispersion relation for a family of Boussinesq-type equations commonly used in modeling of coastal wave transformation. The relation depicts numerical dissipation and dispersion in wave propagation and provides guidelines for model setup in terms of temporal and spatial discretization. The second component was an extension of existing depth-integrated wave models to describe overtopping of coastal reefs and structures along with a series of CFD and laboratory experiments for model validation. The basic approach utilizing the HLLS Riemann solver performs reasonably well and produces stable and efficient numerical results for practical application.

Posted in: Briefs, Aerospace, Defense, Computational fluid dynamics, Marine vehicles and equipment
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Assessment of Non-Traditional Isotopic Ratios by Mass Spectrometry for Analysis of Nuclear Activities

The objective of this work is to identify isotopic ratios suitable for analysis via mass spectrometry that distinguish between commercial nuclear reactor fuel cycles, fuel cycles for weapons grade plutonium, and products from nuclear weapons explosions. Methods will also be determined to distinguish the above from medical and industrial radionuclide sources.

Posted in: Briefs, Aerospace, Defense, Nuclear energy, Identification, Test procedures
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Sound-Off: How to Simulate the Impacts of an Exoskeleton

Over the past decade, warfighters’ personal loads have increased, leading to more injuries, pain, and discomfort. To relieve the burden, the military is investigating performance-enhancing exoskeletons. But how does an exoskeleton impact the soldier wearing it?

Posted in: News, News, Computer-Aided Design (CAD), Simulation Software, Software
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Army to Test-Fire Tactical Missile System

Field artillery soldiers will soon be ready to test-fire the modernized Army Tactical Missile System (ATACMS) at White Sands Missile Range, New Mexico. Bravo Battery, 2nd Battalion, 20th Field Artillery Regiment is undergoing intensive training on the latest versions of software before operational testing.

Posted in: News, Defense
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Researchers Achieve Breakthrough in Nuclear Threat Detection Science

Taking inspiration from an unusual source, a Sandia National Laboratories team has dramatically improved the science of scintillators — objects that detect nuclear threats. According to the team, using organic glass scintillators could soon make it even harder to smuggle nuclear materials through America’s ports and borders.

Posted in: News, Defense, Materials, Detectors
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Batteries That “Drink” Seawater Could Power Long-Range UUVs

The long range of airborne drones helps them perform critical tasks in the skies. Now MIT spinout Open Water Power (OWP) aims to greatly improve the range of unpiloted underwater vehicles (UUVs), helping them better perform in a range of applications under the sea.

Posted in: News, Defense, Energy Storage, Materials, Robotics
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Flight Deck “Ouija Boards” Go Digital

To make the jobs of aircraft handlers easier, the Navy developed the Deployable Ship Integration Multi-touch System (DSIMS), a mobile software package that features a digital touchscreen image of a ship’s flight deck or hangar bay, and can be used on a laptop or desktop computer. It replaces the “Ouija board” replica of the flight deck.

Posted in: News, Defense, Displays/Monitors/HMIs, Imaging
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Reconfigurable Radio Tracks Flights Worldwide

When Malaysia Air Flight 370 disappeared somewhere over the Indian Ocean in 2014, it had flown far beyond radar range. Under a new space-based air tracking system, no plane would ever be off the grid that way — and it is possible thanks in part to a collaboration with NASA, starting with a reconfigurable radio NASA uses to communicate with its satellites, rovers, and astronauts.

Posted in: News, Aerospace, Aviation, Defense
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Survey: Aerospace Engineers Seek Clarity on Cadmium

A survey of more than two hundred aerospace manufacturing professionals demonstrated a lack of understanding about cadmium, a highly toxic metal that is still being used frequently in the U.S. aerospace industry.

Posted in: News, News, Aerospace
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Super-Strong 'Glassy Carbon' is Elastic and Electric

A new compressed form of glassy carbon opens up possibilities for applications requiring low weight and high strength — from aerospace parts to football helmets.

Posted in: News, News, Ceramics
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