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M Messina – 1st expert on this subject based on the ideXlab platform
wind turbine cfd Modeling using a correlation based transitional ModelRenewable Energy, 2013Co-Authors: R Lanzafame, Stefano Mauro, M MessinaAbstract:
This paper describes the development of a Horizontal Axis Wind Turbine 3D CFD Model using the Ansys Fluent solver. The Model was developed to predict wind turbine performance and evaluate the capabilities of the 1D Model (based on BEM Theory) developed by the authors. The two Models were compared in terms of accuracy, predictability and calculation time.
J M Pastor – 2nd expert on this subject based on the ideXlab platform
a 1D Model for the description of mixing controlled reacting diesel spraysCombustion and Flame, 2009Co-Authors: J M Desantes, Jose V Pastor, Jose M Garciaoliver, J M PastorAbstract:
Abstract The paper reports an investigation on the transient evolution of diesel flames in terms of fuel–air mixing, spray penetration and combustion rate. A one-dimensional (1D) spray Model, which was previously validated for inert diesel sprays, is extended to reacting conditions. The main assumptions of the Model are the mixing-controlled hypothesis and the validity of self-similarity for conservative properties. Validation is achieved by comparing Model predictions with both CFD gas jet simulations and experimental diesel spray measurements. The 1D Model provides valuable insight into the evolution of the flow within the spray (momentum and mass fluxes, tip penetration, etc.) when shifting from inert to reacting conditions. Results show that the transient diesel flame evolution is mainly governed by two combustion-induced effects, namely the reduction in local density and the increase in flame radial width.
a 1D Model for the description of mixing controlled inert diesel spraysFuel, 2008Co-Authors: Jose V Pastor, Jose J Lopez, Jose M Garcia, J M PastorAbstract:
The paper reports an investigation focusing on the transient evolution of diesel sprays. In order to understand the relationship between fuel–air mixing and spray penetration, a one-dimensional spray Model is developed, which is capable of predicting the spray behaviour under transient conditions. The main assumptions of the Model are the mixing-controlled hypothesis and the validity of self-similarity for conservative properties. Validation of such concepts is achieved by comparing Model predictions with both CFD gas jet simulations and experimental diesel spray measurements. Results show that a reasonable estimation of the spray evolution can be obtained for both non-vaporising and vaporising conditions.
Enrique Zuazua – 3rd expert on this subject based on the ideXlab platform
lack of collision in a simplified 1D Model for fluid solid interactionMathematical Models and Methods in Applied Sciences, 2006Co-Authors: Juan Luis Vazquez, Enrique ZuazuaAbstract:
In this paper we consider a simplified Model for fluid–solid interaction in one space dimension. The fluid is assumed to be governed by the viscous Burgers equation. It is coupled with a finite number of solid masses in the form of point particles, which share the velocity of the fluid and are accelerated by the jump in velocity gradient of the fluid on both sides, which replaces here the standard pressure jump of Navier–Stokes Models. We prove global existence and uniqueness of solutions. This requires proving that the solid particles never collide in finite time, a key fact that follows from suitable a priori estimates together with uniqueness results for ordinary differential equations. We also describe the asymptotic behavior of solutions as t → ∞, extending previous results established for a single solid mass. The evolution of the relative position of the particles is examined in terms of the strength of the convection term. The possible 2D analogues of these results in the context of Navier–Stokes equations are open problems.
large time behavior for a simplified 1D Model of fluid solid interactionPediatric Dermatology, 2003Co-Authors: Juan Luis Vazquez, Enrique ZuazuaAbstract:
Abstract In this article we consider a simple Model in one space dimension for the interaction between a fluid and a solid represented by a point mass. The fluid is governed by the viscous Burgers equation and the solid mass, which shares the velocity of the fluid, is accelerated by the difference of pressure at both sides of it. We describe the asymptotic behavior of solutions for integrable data using energy estimates and scaling techniques. We prove that the asymptotic profile of the fluid is a self-similar solution of the Burgers equation with an appropriate total mass, and we describe the parabolic trajectory of the point mass. We also prove that, asymptotically, the difference of pressure to both sides of the point mass vanishes. †Dedicated to C. Dafermos on his 60th birthday.