The development of the statistical theory of turbulence mainly take places between 1920 and 1940, in a context where emerging theories in fluid mechanics are striving to provide results closer to experimentation and applicable to practical fluid problems. The secondary literature on the history of fluid mechanics has often emphasized the importance of the contributions of Prandtl, Taylor, and von Kármán to the closure problem of Reynolds equations for a turbulent fluid confined by walls and to the statistical description of (...) an isotropic and homogeneous turbulent flow. During the same period, a new theory of turbulence also surfaces in France. This theory is formulated by a group of researchers led by Philippe Wehrlé (1890–1965), the director of the French National Meteorological Office (Office national météorologique, ONM), and Georges Dedebant (1902–1965), the head of ONM’s Scientific Service. Their objective is to mathematically formalize the turbulence, taking into account the atmospheric turbulence and using a theory of random functions defined from experimental concepts. However, this French theory of turbulence gradually loses international recognition after World War II. After introducing the key figures and the fundamental components of their theory, the article explores various scientific factors why their contribution was increasingly forgotten after the Second World War. (shrink)

ArgumentDuring the interwar period research on turbulence met with interest from different areas: in aeronautical engineering turbulence became a subject of experimental study in wind tunnels; in naval architecture and hydraulic engineering turbulence research was on the agenda because of its role for skin friction; applied mathematicians and theoretical physicists struggled with the problem to determine the onset of turbulence from the fundamental hydrodynamic equations; experimental physicists developed techniques to measure the velocity fluctuations of turbulent flows. In this paper I (...) describe the rise of turbulence in the 1920s and 1930s as a research field under the label of applied mechanics. Although the focus is on Germany, the international development of this research field is illuminated by the role which Ludwig Prandtl played as its acknowledged “chief” (G. I. Taylor). I argue that the multifaceted character of this research field calls for an epistemology and historiography which intrinsically takes the interaction of science and engineering into account. (shrink)