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Dataset for 'DNS of turbulent channel flow over a surrogate for Nikuradse-type roughness'
No full textData related to the publication:
Thakkar, M., Busse, A. & Sandham, N.D. (2017) DNS of turbulent channel flow over a surrogate for Nikuradse-type roughness.
Table1.csv contains data from Table 1 in the paper. Additionally, it contains two more columns, showing the values of ks+ (equivalent sand-grain roughness height in wall-units) and Nikuradse's A parameter, for all cases considered.</span
Data from DNS of Fourier-Filtered Rough Surfaces
No full textData created and presented by F. Alves Portela, A. Busse N. D. Sandham, "Numerical Study of Fourier-Filtered Rough Surfaces". Physical Review Fluids. 2021 (doi: 10.1103/PhysRevFluids.6.084606) as well as height maps of the five surfaces considered.</span
Johanna Busse circa 1920s-1930s
No full textIn 1927 chemist Johanna Busse became the first female section chief at NIST when she was appointed to head the Thermometry section. Busse was also a licensed pilot, and in 1935 she won the Washington Air Derby ten and twenty-five mile air races. That year, there were only 410 female pilots in the United States, out of a total of 14,505 licensed pilots
The Karlsruhe two-scale dynamo experiment
No full textThis article outlines the experimental realization of the Roberts-Busse kinematic dynamo model at the Forschungszentrum Karlsruhe. Essential observations of the spatial and temporal structures of the self-induced magnetic field and features of its saturation mechanism are presented and the experimental findings are compared with predictions from model calculations
Inertial convection in rotating fluid spheres
No full textThe onset of convection in the form of inertial waves in a rotating fluid sphere is studied through a perturbation analysis in an extension of earlier work by Zhang (1994). Explicit expressions for the dependence of the Rayleigh number on the azimuthal wavenumber are derived and new results for the case of a nearly thermally insulating boundary are obtained
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No full textvon MozartKV 620Bibliogr. Nachweis: RISM A/I: M 4797 ; KV deestVorlageform des Erscheinungsvermerks: Braunschweig bei Fr. Busse. [o.Pr.]Lithographi
Parametric forcing approach to rough-wall turbulent channel flow
No full textThe effects of rough surfaces on turbulent channel flow are modelled by an extra force term in the Navier–Stokes equations. This force term contains two parameters, related to the density and the height of the roughness elements, and a shape function, which regulates the influence of the force term with respect to the distance from the channel wall. This permits a more flexible specification of a rough surface than a single parameter such as the equivalent sand grain roughness. The effects of the roughness force term on turbulent channel flow have been investigated for a large number of parameter combinations and several shape functions by direct numerical simulations. It is possible to cover the full spectrum of rough flows ranging from hydraulically smooth through transitionally rough to fully rough cases. By using different parameter combinations and shape functions, it is possible to match the effects of different types of rough surfaces. Mean flow and standard turbulence statistics have been used to compare the results to recent experimental and numerical studies and a good qualitative agreement has been found. Outer scaling is preserved for the streamwise velocity for both the mean profile as well as its mean square fluctuations in all but extremely rough cases. The structure of the turbulent flow shows a trend towards more isotropic turbulent states within the roughness layer. In extremely rough cases, spanwise structures emerge near the wall and the turbulent state resembles a mixing layer. A direct comparison with the study of Ashrafian, Andersson & Manhart (Intl J. Heat Fluid Flow, vol. 25, 2004, pp. 373–383) shows a good quantitative agreement of the mean flow and Reynolds stresses everywhere except in the immediate vicinity of the rough wall. The proposed roughness force term may be of benefit as a wall model for direct and large-eddy numerical simulations in cases where the exact details of the flow over a rough wall can be neglecte
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No full textvon MozartKV 620Bibliogr. Nachweis: RISM A/I: M 4797 ; KV deest ; Frankfurter Ober-Post-Amts-Zeitung, 23. November 1834Vorlageform des Erscheinungsvermerks: Braunschweig bei Busse ; Subscriptions=Preis 1 Rthlr.Lithographi
Opern Ausw / 1 Opern für das Pianoforte ohne Text
No full textvon MozartKV 621 (Anh. B)Bibliogr. Nachweis: RISM A/I deest ; KV deest ; Frankfurter Ober-Post-Amts-Zeitung, 23. November 1834Vorlageform des Erscheinungsvermerks: Braunschweig bei Busse [o.Pr.]Lithographi
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