Fluid Dynamics News

Two new Robert Allan Ltd custom-designed pusher tugs are now being operated along the Amazon River system by Hidrovias do Brasil S.A. (Photo: Robert Allan Ltd)

New Pusher Tugs for Hidrovias do Brasil

, Canada based Robert Allan Ltd, pushing barges containing bulk products along the Amazon River system. This HB PIRARARA shallow-draft pusher tug and sister vessel HB PIRARUCU have a Robert allan RApide 4000-Z3 tug design and were constructed by Estaleiro Rio Maguari in Belem, Brazil.Computational Fluid Dynamics (CFD) simulations were used in the early phases of the design work to optimize the hull shapes and minimize total convoy resistance, and the Z-drives fitted in customized tunnels designed to optimize flow and propulsion efficiency while reducing draft. This resulted in a reduced overall cost

A computer model of an offshore wind turbine supported by a semi-submerged triangular structure. Image: Manchester Metropolitan University

MMU Studies Floating Wind Stabilization

.Static turbines can be fixed to the ocean floor near the coast but the cost and infrastructure complexities of doing so further out to sea mean they would have to be instead mounted on tethered buoyant platforms – exposing them to high winds and large waves.Dr Ling Qian, Reader in Computational Fluid Dynamics at the Center for Mathematical Modelling and Flow Analysis at Manchester Metropolitan University, and the lead academic of the project, said: “The UK is a world leader in developing offshore renewable energy technologies and offshore wind turbines hold huge potential for future energy sustainabi

(Image: BHGI)

New Tailrace Buoy Designed for NYPA

battery boxes for ease of maintenance; ballast compartments for adjustable trim; a taller tower to fit a larger, more visible warning sign and light; and an enhanced mooring system to assure secure placement and allow the buoy to self-deploy with only existing NYPA small boat support. Computational Fluid Dynamics analyses was conducted on the new design to confirm the desired performance once deployed.(Image: BHGI

Photo: BHGI

BHGI Completes Buoy Design for NYPA

battery boxes for ease of maintenance; ballast compartments for adjustable trim; a taller tower to fit a larger, more visible warning sign and light; and an enhanced mooring system to assure secure placement and allow the buoy to self-deploy with only existing NYPA small boat support. Computational Fluid Dynamics analyses was conducted on the new design to confirm the desired performance once deployed

Computational Fluid Dynamics (CFD) can be used to provide an accurate simulation of the response of complex offshore floating structures under realistic sea states, including extreme weather conditions. (Image: HR Wallingford)

New Tools Optimize the Design of Floating Renewable Energy Devices

, “What our new research shows is that by combining open-source numerical tools, we have the potential to simulate with accuracy the response of complex offshore floating structures to environmental loads in the marine environment.”The toolkit consists of two main components: Computational Fluid Dynamics (CFD) using Proteus open-source software, and Multi-Body Dynamics (MBD) using the Chrono open-source solver.  Both models have been thoroughly validated separately and together.Dr. Aggelos Dimakopoulos, Senior Engineer at HR Wallingford, added, “We have put a special focus on the fully

The William B Morgan Large Cavitation Channel (LCC) is a large variable-pressure closed-loop water tunnel that has been operated by the U.S. Navy in Memphis since 1991. This facility is well designed for a wide variety of hydrodynamic and hydroacoustic tests. Its overall size and capabilities allow test-model Reynolds numbers to approach, or even achieve, those of full-scale air- or water-borne transportation systems. (Photo: U.S. Navy)

Navy Tests Scale Models in Big Facilities

observed and recorded during the runs,” Foster added.The tests can be run in many iterations to validate and improve the computer modeling capability at Carderock.A significant amount of testing is conducted before coming to the LCC. “We can do our computer modeling of the computational fluid dynamics, then build a physical model to test in our tow tank. Then we can test that model, or a larger one, in the LCC. Eventually, our signatures department can conduct acoustic testing at the ARD in Idaho.Using data obtained from testing models in the Carderock facilities, the computer models are improved

(U.S. Coast Guard photo by Stephen Lehmann)

Did Dispersants Help Responders Breathe Easier at Deepwater Horizon?

ocean—data that we needed to confirm that the model adequately simulates what actually occurred.   In the model, we carefully weave together several different dynamic physical and chemical effects that are “coupled” together. These included the changing chemical compositions, fluid dynamics and interlinked movements of oil droplets, gas bubbles and seawater in the deep sea.  To understand what happened, these interdependent problems all have to be solved at the same time. The resulting model is very complex. The equations can be solved with a desktop computer—but only

(Photo: James Fisher Subsea Excavation)

New Water Jet Promises to Boost Soil Cutting Capabilities

global market,” said Graham Murdoch, technical director at JFSE, commenting on this latest M/CFE innovation.   “Discussions with our clients identified this enhancement would offer significant benefits,” Murdoch continued. “We undertook a detailed computational fluid dynamics exercise to fully understand the effects of this setup and the results were impressive. We can now cut soils with shear strengths almost double that which any other M/CFE system can realize.”   The jets are now being fitted to JFSE tools which are stationed at strategic hubs in the

Ed Hill (Photo: NOC)

Voices: NOC Executive Director Ed Hill

you interested in the oceans to begin with? I started off like many oceanographers: in a completely different discipline. I’m an applied mathematician and that’s how I started. I was always interested in the sea since I was brought up by the sea when I was a kid. I became interested in fluid dynamics and then realized the ocean was a great place for that. I’ve been running research institutes for nearly 20 years, first a small institution, and then I had the privilege to be in charge of the U.K.’s National Oceanography Center.    What do you consider to be your greatest

Subsea View of Inverted Helical Grooves on Drill Riser Buoyancy (Image: Trelleborg)

Revolutionizing Deepwater Drilling Riser Buoyancy

cost savings and safer well completions, persists.    As companies move to water depths past 12,000 feet the technology they use has evolved. Extensive engineering design work is now performed using specialized software to produce local and global finite element (FE) and computational fluid dynamics (CFD) analysis to develop optimum designs. The ability to model equipment and system responses to environmental forces helps advance product development and design opportunities to maximize operational efficiency, resulting in cost savings, increased service life and multi-functional designs

Marine Technology Magazine Cover Mar 2020 -

Marine Technology Reporter is the world's largest audited subsea industry publication serving the offshore energy, subsea defense and scientific communities.

Subscribe
Marine Technology ENews subscription

Marine Technology ENews is the subsea industry's largest circulation and most authoritative ENews Service, delivered to your Email three times per week

Subscribe for MTR E-news