This paper introduces a design and fabrication pipeline for creating floating forms. Our method optimizes for buoyant equilibrium and stability of complex 3D shapes, applying a voxel-carving technique to control the mass distribution. The resulting objects achieve a desired floating pose defined by a user-specified waterline height and orientation. In order to enlarge the feasible design space,...

numerical study of double-diffusive natural convective heat transfer in a curved cavity filledwith a porous medium has been carried out in the current study. polar system has beenselected as coordinate system. as a result, all equations have been discredited in r and θdirections. brinkmann extended darcy model has been utilized to express fluid flow inporous matrix in the enclosure. smaller and...

Surf-riding actions in reliable attractive following oceans for cases with a variety of LCBs and Froude information are mimicked utilizing the numerical model. Comes concerning display that the surfriding can't be forestalled by the modify of LCB. Be that as it may, it happens with an upper limit momentum when ship's focal point of lightness (COB) is stimulated towards stem contrasted with affe...

The swimbladder plays an important role in buoyancy regulation but is typically reduced or even absent in benthic freshwater fishes that inhabit fast flowing water. Here, we document, for the first time, a remarkable example of swimbladder sexual dimorphism in the highly rheophilic South Asian torrent minnows (Psilorhynchus). The male swimbladder is not only much larger than that of the female ...

We present a bioenergetic model for buoyancy regulation that incorporates the restrictions and costs of swimbladder regulation with four means of hydrodynamic lift production: hovering, swimming with extended pectoral fins, swimming with adjusted tilt angle, and body lift. Previous models addressing vertical migration in fish with swimbladders have either assumed no energetic cost or a static c...

Sperm whales feed primarily on squid and often have to find their food at depths between 1000 and 2000 meters. To do this they require sophisticated buoyancy regulation. It has been known for some time that they achieve long-term buoyancy regulation by altering the temperature of their spermaceti organ, located in the enlarged snout. In a large male this organ may contain four tons of spermacet...

Thermal perturbation of mantle phase relations in subduction zones gives rise to significant buoyancy anomalies. Finite element modeling of stresses arising from these anomalies reveals transition from principal tension to compression near ∼400 km depth, down-dip compression over ∼400-690 km (peaking at ∼550 km), and transition to rapidly fading tension below ∼690 km. Such features, even when c...

This year’s cover illustration, reproduced here as figure 1, depicts an image formed by a short-time (1/1000 s) exposure of a non-premixed hydrocarbon flame. The flow is driven by the buoyancy forces generated by the density difference from the combustion heat release and resulting temperature rise. The Reynolds number for this buoyancy-induced, turbulent flow is relatively low, estimated at a ...

We have developed an underwater robot that can pick up and place objects during an autonomous underwater mission. This robot will have changing weight and dynamics during a mission. We have developed an efficient method for buoyancy control to achieve adaptation to weight changes without the need to increasing the work of the robot’s thruster system. In this paper we describe the mechanism used...