FLUID DYNAMICS OF NSR STRINGS

Fluid Dynamics of NSR Strings

We show that the renormalization group flows of the massless superstring modes in the presence of fluctuating D-branes satisfy the equations of fluid dynamics. In particular, we show that the D-brane’s U(1) field is related to the velocity function in the Navier-Stokes equation while the dilaton plays the role of the passive scalar advected by the turbulent liquid. This leads us to suggest a po...

Dynamics of chaotic strings

Dynamics of ( n , 1 ) Strings

An (n, 1) string is a bound state of a D-string and n fundamental strings. It may be described by a D-string with a world volume electric field turned on. As the electric field approaches its critical value, n becomes large. We calculate the 4-point function for transverse oscillations of an (n, 1) string, and the two-point function for massless closed strings scattering off an (n, 1) string. I...

Perturbative Dynamics of Fractional Strings on Multiply Wound D-strings

Fractional strings in the spectrum of states of open strings attached to a multiply wound D-brane is explained. We first describe the fractional string states in the low-energy effective theory where the topology of multiple winding is encoded in the gauge holonomy. The holonomy induces twisted boundary conditions responsible for the fractional moding of these states. We also describe fractiona...

Hydrodynamic Improvement of underwater glider by Computational Fluid Dynamics method

Gliders are new marine vehicles which have research and military uses and they move by sequent diving and climbing. Suitable design of its main body and wings are important for the most advance velocity. hydrodynamic design variables are main body form, wings (cross section, dimensions, shape, longitudinal and vertical position) and hydrostatic parameters (static trim angle, amount of added for...