 Member since Aug '08
Working languages: English to ItalianCatalan to ItalianSpanish to ItalianItalian to EnglishCatalan to English |
|  Milena Bosco
NA Local time: 16:10 CET (GMT+1)
Native in: Italian  , Catalan | |
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More Less | | Questions answered: 484, Questions asked: 1 Easy / 9 PRO, PRO-level points: 536 | Sample translations submitted: 1| Catalan to English: Fluid mechanics, Navier-Stokes. | Source text - Catalan
En aquest article presentarem dos temes que tradicionalment s’han estudiat
de manera independent però per als quals recentment s’ha plantejat un possible
nexe d’unió: la descripció matemàtica de la turbulència en problemes
de mecànica de fluids i les inestabilitats numèriques que s’observen quan les
equacions que regeixen el fenomen s’aproximen amb algun mètode numèric.
La turbulència dels fluids és sens dubte un problema pendent de la física
clàssica. Malgrat que les equacions de Navier-Stokes de la mecànica de fluids
s’accepten com a model matemàtic, no es coneix encara un teorema complet
d’existència i unicitat de solució per al problema d’evolució. El que sí que
se sap (per abundant experiència numèrica i diversos resultats analítics parcials)
és que admeten solucions «caòtiques». El problema, des del punt de
vista físic, és tenir controlades aquestes solucions, per exemple, calculant-ne
(o fitant-ne) paràmetres estadístics o coneixent-ne el comportament qualitatiu.
Des del punt de vista numèric, l’aproximació de les equacions de Navier-
Stokes presenta diversos tipus d’inestabilitats. De fet, l’únic terme sobre el
qual es pot tenir control numèric és sobre el viscós, i si aquest terme és petit
per comparació al convectiu (o al de rotació, si n’hi ha), la solució numèrica és
molt dolenta.
En els darrers anys s’han seguit dues línies de recerca paral.leles en el
desenvolupament de models matemàtics de turbulència i d’aproximació numèrica
que tenen una arrel comuna, la qual cosa indica que ambdues línies
podrien arribar a unificar-se. Per un costat, els models anomenats de «large
eddy simulation» (LES) es basen a descompondre la incògnita (la velocitat) en
una escala macroscòpica i una de microscòpica i obtenir una equació només
per a la primera, però tenint en compte l’efecte de les escales microscòpiques,
tradicionalment anomenades subescales.
| Translation - English
In this article we will introduce two subjects that traditionally have been studied independently but for which a possible link has been set out: the mathematical description of turbulence in problems related to fluid mechanics and the numerical instabilities that can be observed when the equations that regulate the phenomenon are approximated by a numerical method.
The turbulence in fluids is, without a shadow of a doubt, an open issue in classic Physics. Despite the fact that Navier-Stokes equations in fluid mechanics are accepted as a mathematical model, an exhaustive theorem about existence and singleness of solutions for the evolution problem is still unknown. What we know (thanks to an abundant numerical experience and several partial analytic results) is that they admit “chaotic” solutions. The problem from a Physics point of view, is to keep track of these solutions, calculating (or fitting) their statistical parameters, or evaluating their qualitative behavior. From a numerical point of view, the approximation of Navier-Stokes equations shows several types of instabilities. Practically the only term on which a numerical control can be applied is the viscous one, and if this term is small compared to the convective one (or the rotary one, if there is any), the numerical solution is dissatisfactory.
In the past years two parallel paths of research have been followed in the development of mathematical models of turbulence and numerical approximation which have a common root, this indicating that the two paths might become one. On one side the models known as “large eddy simulation” (LES) are based on separating the unknown quantity (velocity) in a macroscopic scale and in a microscopic scale, to obtain an equation only for the former, but keeping in mind the effects of microscopic scales, traditionally called “subscales”.
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More Less | | Years of translation experience: 16. Registered at ProZ.com: May 2008. Became a member: Aug 2008. | | N/A | | N/A | | N/A | | Microsoft Excel, Microsoft Word, Powerpoint, SDL TRADOS | | CV available upon request | | Milena Bosco endorses ProZ.com's Professional Guidelines. | | About me
Math is the common denominator of reality. Everything is math, and math is my passion. Translating is math as well: when applying rigorous and strict mathematical steps a translator can achieve the best results. I speak Castellano (Spanish) Catalan and Italian (all of them mothertongue). I took several certifications as far as the English language is concerned: First Certificate, CPE (Proficiency), TOEFL (270/300), GRE (Graduate Record Examination, after my degree, with top scores). I have over 16 years of experience in translating confidential (mostly business confidential) and scientific texts. I worked for the "New York Times" in the culinary field. My passion for cuisine allowed me to deepen my specific knowledge with attention to detail, allowing me to become a restaurant manager for a top notch establishment for several years. This experience "on the field" is fundamental when it comes to translations in the specific jargon.
After having met the perfect partner, I have become a very fortunate Wife and Mom. I am determined and happy to pursue my professional career as a freelance translator.
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May 20 |
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