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Theodore Von Kármán
Theodore von Kármán ( hu, ( szőllőskislaki) Kármán Tódor ; born Tivadar Mihály Kármán; 11 May 18816 May 1963) was a Hungarian-American mathematician, aerospace engineer, and physicist who was active primarily in the fields of aeronautics and astronautics. He was responsible for many key advances in aerodynamics, notably on supersonic and hypersonic airflow characterization. He is regarded as an outstanding aerodynamic theoretician of the 20th century. Early life Theodore von Kármán was born into a Jewish family in Budapest, Austria-Hungary, as Kármán Tódor, the son of Helen (Kohn, hu, Kohn Ilka) and Mór Kármán. One of his ancestors was Rabbi Judah Loew ben Bezalel. He studied engineering at the city's Royal Joseph Technical University, known today as Budapest University of Technology and Economics. After graduating in 1902 he moved to the German Empire and joined Ludwig Prandtl at the University of Göttingen, where he received his doctorate in 1908. He ta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
California Institute Of Technology
The California Institute of Technology (branded as Caltech or CIT)The university itself only spells its short form as "Caltech"; the institution considers other spellings such a"Cal Tech" and "CalTech" incorrect. The institute is also occasionally referred to as "CIT", most notably in its alma mater, but this is uncommon. is a private university, private research university in Pasadena, California. Caltech is ranked among the best and most selective academic institutions in the world, and with an enrollment of approximately 2400 students (acceptance rate of only 5.7%), it is one of the world's most selective universities. The university is known for its strength in science and engineering, and is among a small group of Institute of Technology (United States), institutes of technology in the United States which is primarily devoted to the instruction of pure and applied sciences. The institution was founded as a preparatory and vocational school by Amos G. Throop in 1891 and began ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ernest Edwin Sechler
Ernest Edwin Sechler (1905-1979) was an aerospace engineer and scientist who specialized in thin-shell structures. He earned his doctorate in 1934 at Caltech as one of the early students of Theodore von Kármán with a dissertation on the mechanics of thin-plate compression. Hans W. Liepmann (1984Ernest Edwin Sechler in ''Memorial Tributes: National Academy of Engineering'', Vol. 2, 258-261, link from National Academies Press Sechler contributed to the transition from wood to metal for construction of airframes. :A graduate student named Ernest E. Sechler (now a professor of aeronautics at Caltech) was reviewing research in the strength of thin metal plates which had been carried out by the National Bureau of Standards. Sechler reported that the engineers didn’t think that sheet metal could be used to make structural elements in an airplane because the metal would give way...Sechler’s report intrigued me. Von Kármán showed that by stiffening with re-enforcing strips the "e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Von Kármán Swirling Flow
Von Kármán swirling flow is a flow created by a uniformly rotating infinitely long plane disk, named after Theodore von Kármán who solved the problem in 1921. The rotating disk acts as a fluid pump and is used as a model for centrifugal fans or compressors. This flow is classified under the category of steady flows in which vorticity generated at a solid surface is prevented from diffusing far away by an opposing convection, the other examples being the Blasius boundary layer with suction, stagnation point flow etc. Flow description Consider a planar disk of infinite radius rotating at a constant angular velocity \Omega in fluid which is initially at rest everywhere. Near to the surface, the fluid is being turned by the disk, due to friction, which then causes centrifugal forces which move the fluid outwards. This outward radial motion of the fluid near the disk must be accompanied by an inward axial motion of the fluid towards the disk to conserve mass. Theodore von Kármán ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Von Kármán Constant
In fluid dynamics, the von Kármán constant (or Kármán's constant), named for Theodore von Kármán, is a dimensionless constant involved in the logarithmic law describing the distribution of the longitudinal velocity in the wall-normal direction of a turbulent fluid flow near a boundary with a no-slip condition. The equation for such boundary layer flow profiles is: :u=\frac\ln\frac, where ''u'' is the mean flow velocity at height ''z'' above the boundary. The roughness height (also known as roughness length) ''z0'' is where u appears to go to zero. Further ''κ'' is the von Kármán constant being typically 0.41, and u_\star is the friction velocity which depends on the shear stress ''τw'' at the boundary of the flow: :u_\star = \sqrt, with ''ρ'' the fluid density. The Kármán constant is often used in turbulence modeling, for instance in boundary-layer meteorology to calculate fluxes of momentum, heat and moisture from the atmosphere to the land surface. It is cons ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kármán Vortex Street
In fluid dynamics, a Kármán vortex street (or a von Kármán vortex street) is a repeating pattern of swirling vortices, caused by a process known as vortex shedding, which is responsible for the unsteady separation of flow of a fluid around blunt bodies. It is named after the engineer and fluid dynamicist Theodore von Kármán, and is responsible for such phenomena as the " singing" of suspended telephone or power lines and the vibration of a car antenna at certain speeds. Mathematical modeling of von Kármán vortex street can be performed using different techniques including but not limited to solving the full Navier-Stokes equations with k-epsilon, SST, k-omega and Reynolds stress, and large eddy simulation (LES) turbulence models, by numerically solving some dynamic equations such as the Ginzburg-Landau equation, or by use of a bicomplex variable. Analysis A vortex street will form only at a certain range of flow velocities, specified by a range of Reynolds nu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frank E
Frank or Franks may refer to: People * Frank (given name) * Frank (surname) * Franks (surname) * Franks, a medieval Germanic people * Frank, a term in the Muslim world for all western Europeans, particularly during the Crusades - see Farang Currency * Liechtenstein franc or frank, the currency of Liechtenstein since 1920 * Swiss franc or frank, the currency of Switzerland since 1850 * Westphalian frank, currency of the Kingdom of Westphalia between 1808 and 1813 * The currencies of the German-speaking cantons of Switzerland (1803–1814): ** Appenzell frank ** Argovia frank ** Basel frank ** Berne frank ** Fribourg frank ** Glarus frank ** Graubünden frank ** Luzern frank ** Schaffhausen frank ** Schwyz frank ** Solothurn frank ** St. Gallen frank ** Thurgau frank ** Unterwalden frank ** Uri frank ** Zürich frank Places * Frank, Alberta, Canada, an urban community, formerly a village * Franks, Illinois, United States, an unincorporated community * Franks, Missour ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wallace D
Wallace may refer to: People * Clan Wallace in Scotland * Wallace (given name) * Wallace (surname) * Wallace (footballer, born 1986), full name Wallace Fernando Pereira, Brazilian football left-back * Wallace (footballer, born 1987), full name Wallace Reis da Silva, Brazilian football centre-back * Wallace (footballer, born May 1994), full name Wallace Oliveira dos Santos, Brazilian football full-back * Wallace (footballer, born October 1994), full name Wallace Fortuna dos Santos, Brazilian football centre-back * Wallace (footballer, born 1998), full name Wallace Menezes dos Santos, Brazilian football midfielder Fictional characters * Wallace, from ''Wallace and Gromit'' * Wallace (''Pokémon'') * Wallace (''Sin City'') * Wallace (''The Wire'') * Wallace Breen, from ''Half-Life 2'' * Wallace Fennel, from ''Veronica Mars'' * Wallace Footrot, from '' Footrot Flats'' * Eli Wallace, from ''Stargate Universe'' * Wallace, from "The Hangover Part III" * Wallace the Brave, fro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stanford S
Stanford University, officially Leland Stanford Junior University, is a private research university in Stanford, California. The campus occupies , among the largest in the United States, and enrolls over 17,000 students. Stanford is considered among the most prestigious universities in the world. Stanford was founded in 1885 by Leland and Jane Stanford in memory of their only child, Leland Stanford Jr., who had died of typhoid fever at age 15 the previous year. Leland Stanford was a U.S. senator and former governor of California who made his fortune as a railroad tycoon. The school admitted its first students on October 1, 1891, as a coeducational and non-denominational institution. Stanford University struggled financially after the death of Leland Stanford in 1893 and again after much of the campus was damaged by the 1906 San Francisco earthquake. Following World War II, provost of Stanford Frederick Terman inspired and supported faculty and graduates' entrepreneurialism ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chia-Chiao Lin
Chia-Chiao Lin (; 7 July 1916 – 13 January 2013) was a Chinese-born American applied mathematician and Institute Professor at the Massachusetts Institute of Technology. Lin made major contributions to the theory of hydrodynamic stability, turbulent flow, mathematics, and astrophysics. Biography Lin was born in Beijing with ancestral roots in Fuzhou. In 1937 Lin graduated from the department of physics, National Tsinghua University in Beijing. After graduation he was a teaching assistant in the Tsinghua University physics department. In 1939 Lin won a Boxer Indemnity Scholarship and was initially supported to study in the United Kingdom. However, due to World War II, Lin and several others were sent to North America by ship. Unluckily, Lin's ship was stopped in Kobe, Japan, and all students had to return to China. In 1940, Lin finally reached Canada and studied at the University of Toronto from which he earned his M.Sc. In 1941. Lin continued his studies in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Guo Yonghuai
Guo Yonghuai, or Yung-huai Kuo (; April 4, 1909 – December 5, 1968) was a Chinese aerospace engineer. He was an expert in aerodynamics. Biography Guo was born in Rongcheng, Shandong, and graduated from the department of physics of Peking University in 1935. He enrolled in an oversea program in 1939 and entered the University of Toronto in Canada in 1940 and obtained a master's degree there. From 1941 to 1945, Guo studied compressible hydrodynamics at Caltech. After obtaining the Ph.D degree, he stayed there as a research fellow. From 1946, he became an associate professor and later, professor at Cornell University. Invited by Tsien Hsue-shen, Guo returned to China in October 1956 and became the vice director of the Institute of Mechanics of the Chinese Academy of Sciences (CAS). Guo was a founder of mechanics in mainland China and made significant contributions to mechanics, applied mathematics and aeronautics. In 1958, he helped found the University of Science and Technol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Homer J
Homer Jay Simpson is a fictional character and the main protagonist of the American animated sitcom ''The Simpsons''. He is voiced by Dan Castellaneta and first appeared, along with the rest of his family, in ''The Tracey Ullman Show'' short " Good Night" on April 19, 1987. Homer was created and designed by cartoonist Matt Groening while he was waiting in the lobby of producer James L. Brooks's office. Groening had been called to pitch a series of shorts based on his comic strip ''Life in Hell'' but instead decided to create a new set of characters. He named the character after his father, Homer Groening. After appearing for three seasons on ''The Tracey Ullman Show'', the Simpson family got their own series on Fox, which debuted December 17, 1989. The show was later acquired by Disney in 2019. As the nominal foreman of the paternally eponymous family, Homer and his wife Marge have three children: Bart, Lisa and Maggie. As the family's provider, he works at the Springfiel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frank Malina
Frank Joseph Malina (October 2, 1912 — November 9, 1981) was an American aeronautical engineer and painter, especially known for becoming both a pioneer in the art world and the realm of scientific engineering. Early life Malina was born in Brenham, Texas. His father came from Bohemia. Frank's formal education began with a degree in mechanical engineering from Texas A&M University in 1934. The same year he received a scholarship to study mechanical engineering at the California Institute of Technology (Caltech), where he obtained his doctoral degree in 1940. In 1935, while a graduate student at Caltech, Malina persuaded Professor of Aeronautics Theodore von Kármán to allow him to pursue studies into rocketry and rocket propulsion. The formal goal was development of a sounding rocket. Malina and five associates (including Jack Parsons and Hsue-Shen Tsien) became known at Caltech as the "Suicide Squad" because of their dangerous experiments (and failures) when testing rocket ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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