[FRANCE] Adh_mar Jean Claude Barr_ de Saint-Venant (1797-1886) French mechanician and mathematician who contributed to early stress analysis and also developed the one-dimensional unsteady open channel flow shallow water equations or Saint-Venant equations that are a fundamental set of equations used in modern hydraulic engineering . Although his surname was Barr_ de Saint-Venant in non-French mathematical literature he is known simply as Saint-Venant. His name is also associated with Saint-Venant's principle of statically equivalent systems of load, Saint-Venant's theorem and for Saint-Venant's compatibility condition, the integrability conditions for a symmetric tensor field to be a strain. In 1843 he published the correct derivation of the Navier-Stokes equations for a viscous flow and was the first to "properly identify the coefficient of viscosity and its role as a multiplying factor for the velocity gradients in the flow". Although he published before Stokes the equations do not bear his name. In 1868, at 71 years old, he was elected to succeed Poncelet in the mechanics section of the Acad_mie des Sciences. In 1869 he was given the title 'Count' (comte) by Pope Pius IX. ALS, 1861, 2pp, approx. 5-1/4 x 8-1/4". There is a tear coming up from botton edge that touches the signature but no loss of paper.

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by East Coast Books
August 25, 2018 10:00 AM EDT
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