The core theorem on which the above paper is centred—that a perfectly conducting body of revolution absorbs no angular momentum from an axisymmetric electromagnetic wave field—is in fact a special case of a more general result in electromagnetic scattering theory. In addition, the scaling of the efficiency of transfer of angular momentum to an object with the wavelength and object size merits f...

The core theorem on which the above paper is centred—that a perfectly conducting body of revolution absorbs no angular momentum from an axisymmetric electromagnetic wave field—is in fact a special case of a more general result in electromagnetic scattering theory. In addition, the scaling of the efficiency of transfer of angular momentum to an object with the wavelength and object size merits f...

The Rayleigh hypothesis is employed to solve the forward problem of scattering of a known, arbitrary acoustic wave from a body of revolution immersed in a shallow body of water. The acoustic wavefields obtained in this way are then employed as simulated data for the inverse problem of the determination of the (unknown) size, shape and depth of the immersed body, which is known to be acousticall...

For a sufficiently slender axially symmetric body placed in a uniform stream, only convectively unstable modes are found in previous experiments. This work imposes theoretically and computationally a pair of most unstable helical modes, symmetrically and asymmetrically. The Reynolds stress modification of the developing laminar mean wake flow is modified into an elliptic-like cross section for ...

Abstract Computationally efficient and accurate simulations of the flow over axisymmetric bodies revolution (ABR) have been an important desideratum for engineering design. In this article, field ABR is predicted using machine learning (ML) algorithms (e.g., random forest (RF), artificial neural network (ANN), convolutional (CNN)) trained ML models as surrogates classical computational fluid dy...

As identified in the CFD Vision 2030 Study commissioned by NASA, validation of advanced RANS models and scale-resolving methods for computing turbulent flow fields must be supported by continuous improvements in fundamental, high-fidelity experiments designed specifically for CFD implementation. In accordance with this effort, the underpinnings of a new test platform referred to herein as the N...

We study the axisymmetric surface diffusion (ASD) flow, a fourth-order geometric evolution law. In particular, we prove that ASD generates a real analytic semiflow in the space of (2+α)-little-Hölder regular surfaces of revolution embedded in R3 and satisfying periodic boundary conditions. Further, we investigate the geometric properties of solutions to ASD. Utilizing a connection to axisymmetr...

This paper presents 2-D finite volume method for computation of viscous drag based on Reynolds-averaged Navier-Stokes (RANS) equations. Computations are performed on bare submarine hull DREA and six axisymmetric bodies of revolution with a number of length-diameter (L/D) ratios ranging from 4 to 10. Both structured and unstructured grids are used to discretize the domain around the bodies. Diff...