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Multiphysics Modeling Simplifies Analysis of Electrical and Electromagnetic Effects

Effects of lightning strikes and electromagnetic fields are simulated and modeled easily. The Saab Group has 17 business units, which are split into defense and security, systems and products, and aeronautics. Over the years, the company has taken advantage of the many paradigm shifts that have taken place in engineering analysis. One example is implementing comprehensive engineering methodologies that combine traditional experiments and testing with newer tools such as computer modeling and simulation. In the 1980s, Saab began applying largescale computer simulations, which were used to verify the lightning-protection components in the wings of the Gripen fighter aircraft.

Posted in: Briefs

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Geophysical Wave Propagation Calculation Using Multiphysics

Geologists can conduct in-field calculations without the need for large computing resources. The propagation of shear (S) and compression (P) waves within the Earth represents a critically important phenomenon for geologists. For many years, geologists have developed specialized computational programs to calculate wave propagation within complex geophysical regions. These programs have been instrumental in determining the location and characteristics of natural phenomena (e.g., earthquakes) and manmade activity (e.g., nuclear-blast tests).

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Simulating the Manufacturing Process of Ceramic Matrix Composites

Multiphysics simulation enables analysis of a range of physical phenomena occurring in the manufacturing process. Increasing the temperature at which jet aircraft engines operate would significantly improve thrust and fuel efficiency with reduced emissions. However, current engines operate within 50 degrees of the inherent melting point of the conventional materials used in engine construction. Thus, new materials capable of operating at higher temperatures for prolonged times must be developed and manufactured.

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3D Program Aids Design of Custom Iron Work

Software allows architectural iron works manufacturer to simplify the design process. Keuka Studios designs and manufactures custom architectural iron work and cable railings for commercial and home use. Keuka Studios first designs a product in CAD, CNC machines it to shape, and then takes the assembly to their forge, which adds the design elements. Dan White, founder and president of Keuka Studios, was frustrated by the limitations of existing design tools. Despite over 25 years of experience as a mechanical engineer with a deep working knowledge of 3D CAD, animation, rendering, and finite element analysis software, he could not be as creative with product design as he wanted.

Posted in: Software, Briefs

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Displaying CFD Solution Parameters on Arbitrary Cut Planes

USMC6 is a Fortran 90 computer program for post-processing in support of visualization of flows simulated by computational fluid dynamics (CFD). The name “USMC6” is partly an abbreviation of “TetrUSS — USM3D Solution Cutter,” reflecting its origin as a post-processor for use with USM3D — a CFD program that is a component of the Tetrahedral Unstructured Software System and that solves the Navier-Stokes equations on tetrahedral unstructured grids. “Cutter” here refers to a capability to acquire and process solution data on (1) arbitrary planes that cut through grid volumes, or (2) user-selected spheroidal, conical, cylindrical, and/or prismatic domains cut from within grids. Cutting saves time by enabling concentration of post-processing and visualization efforts on smaller solution domains of interest.

Posted in: Briefs, TSP

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Flow Solver for Incompressible 2-D Drive Cavity

This software solves the Navier- Stokes equations for the incompressible driven cavity flow problem. The code uses second-order finite differencing on a staggered grid using the Chorin projection method. The resulting intermediate Poisson equation is efficiently solved using the fast Fourier transform.

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Flow Solver for Incompressible Rectangular Domains

This is an extension of the Flow Solver for Incompressible 2-D Drive Cavity software described in the preceding article. It solves the Navier- Stokes equations for incompressible flow using finite differencing on a uniform, staggered grid. There is a runtime choice of either central differencing or modified upwinding for the convective term. The domain must be rectangular, but may have a rectangular walled region within it. Currently, the position of the interior region and exterior boundary conditions are changed by modifying parameters in the code and recompiling. These features make it possible to solve a variety of classical fluid flow problems such as an L-shaped cavity, channel flow, or wake flow past a square cylinder. The code uses fourth-order Runge-Kutta time-stepping and overall second-order spatial accuracy.

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