Solid particles in protoplanetary disks that are sufficiently super-solar in metallicity overcome turbulence generated by vertical shear to gravitationally condense into planetesimals. Super-solar metallicities result if solid particles pile up as they migrate starward due to aerodynamic drag. Previous analyses of aerodynamic drift rates that account for mean flow differences between gas and pa...

Experiments are carried out to study static pressure distribution and drag variations over NACA0018 aerofoil and over an automobile dome. Static pressure coefficients are calculated along the chord length for different angles of attack for both the test models and the results are compared. Further, the relationship between coefficient of drag and Reynolds number has been arrived for different a...

A theory is presented to interpret the phonon drag magneto-thermopower oscillations observed in a periodically modulated two-dimensional electron gas. The thermoelectric and phonon drag tensors are obtained by solving a Boltzmann equation driven by an anisotropic electron-phonon scattering rate reflecting the twofold symmetry of the Fermi surface. It is shown that commensurability oscillations ...

in this paper, lift and drag coefficients were numerically investigated using numeca software in a set of 4-digit naca airfoils. two metamodels based on the evolved group method of data handling (gmdh) type neural networks were then obtained for modeling both lift coefficient (cl) and drag coefficient (cd) with respect to the geometrical design parameters. after using such obtained polynomial n...

In many cases, a set of obstacles, such as bridge piers and abutments, are located in the river waterway. Bridge piers disrupt river’s normal flow, and the created turbulence and disturbance causes diversion of flow lines and creates rotational flow. Geometric shape and position of the piers with respect to flow direction and also number of piers and their spacing are effective on changing the ...

A method is described for measuring the local drag coefficient on a long cylinder which exhibits vortex-induced vibration (VIV). Results are shown from a field experiment in which a long flexible pipe was instrumented with two-hundred and eighty fiber optic strain gauges. The measured local drag coefficients are compared to a commonly used drag coefficient prediction formula. The formula is sho...