329 SEDOV 



SEDQV, LEONID IVANQVICH (Mechanics Physicist) 



L. I. Sedov was born November 14, 1907. In 1931 he gradu- 

 ated from Moscow University and in 1937 was appointed pro- 

 fessor there. He began work in 1931 at the Central Aerohydro- 

 dynamic Institute. In 1947 he started working at the Central 

 Institute of Aviation Motor Building. Sedov is Chairman of the 

 Interdepartmental Commission on Coordination and Control of 

 Scientific Theoretical Research in the Area of Organization and 

 Realization of Interplanetary Communication. In 1946 he was 

 elected a Corresponding Member of the U.S.S.R. Academy of 

 Sciences and in 1953 an Academician. The U.S.S.R. Academy of 

 Sciences awarded Sedov in 1946 the Prize of S. A. Chaplygin. 

 In 1952 he received a Stalin Prize. 



Sedov investigated various problems of mechanics. He de- 

 termined the aerodynamic forces during a non- stabilized move- 

 ment of the wings, in particular during vibrations. Sedov 

 generalized the theorem of N. E. Zhukovskii for arbitrary mo- 

 tion of the wing; formulated a mathematical method for solving 

 problems of stream flow around wing profiles. This method 

 was applied by him to the theory of a finite wing, and subse- 

 quently widely applied in the theory of waves, in elasticity, and 

 in filtration. In his treatise "Plane Problems of Hydrodynamics 

 and Aerohydrodynamics," Sedov formulated a theory on gliding 

 which was applied in hydroaviation and ship building. Sedov 

 studied the impact of bodies against water, ricocheting and 

 other problems of heavy liquid hydrodynamics. He developed a 

 method for visualizing the stream line flow of gas past a grat- 

 ing and worked out a method for investigating possible gas 

 flows, widening the approximate method of S. A. Chaplygin. In 

 the theory of similarity and dimensionality, Sedov constructed 

 a theory of unstabilized gas motion, in particular the theory of 

 dispersion of strong shock waves, obtained results on the theory 

 of surface waves; established the law of pulsation in an iso- 

 tropic turbulence. His work "Propagation of Strong Explosive 

 Waves" (1946) is a study of strong shock waves. Sedov has also 

 been concerned with problems of astrophysics. 

 Bibliography: 



Propagation of strong explosive waves. Priklad. Mat. i 

 Mekh., 1946, 10, #2. 



On some unsettled movements of compressible liquid. Prik- 

 lad. Mat. i Mekh., 1945, _9, #4. 



Plane Problems of Hydrodynamics and Aerodynamics. 

 Moscow-Leningrad: 1950. 



