نتایج جستجو برای: froude numbe

تعداد نتایج: 1064  

2009
Roger Grimshaw Montri Maleewong Jack Asavanant

In previous work, we investigated two-dimensional steady gravity-capillary waves generated by a localized pressure distribution moving with constant speed U in water of finite depth h . Localized solitary waves can only exist in subcritical flows where the Froude number F = U/(gh) < 1 , and were found using a combination of numerical simulations of the fully nonlinear inviscid, irrotational equ...

Journal: :Math. Comput. 1996
Johan F. Malmliden N. Anders Petersson

We develop an efficient iterative method for computing the steady linearized potential flow around a submerged body moving in a liquid of finite constant depth. In this paper we restrict the presentation to the twodimensional problem, but the method is readily generalizable to the threedimensional case, i.e., the flow in a canal. The problem is indefinite, which makes the convergence of most it...

2008
Raymond Bergmann Devaraj van der Meer Stephan Gekle Arjan van der Bos Detlef Lohse

In this paper we study the transient surface cavity which is created by the controlled impact of a disk of radius h0 on a water surface at Froude numbers below 200. The dynamics of the transient free surface is recorded by high speed imaging and compared to boundary integral simulations. An excellent agreement is found between both. The flow surrounding the cavity is measured with high speed pa...

2004
C. A. Gonzalez H. Chanson

In the last two decades, research on the hydraulics of skimming flows down stepped chutes was driven by needs for better design guidelines. Skimming flows are characterized by significant momentum transfer from the main stream to the recirculation zones. Investigations are difficult because of the complex nature of the flow, the strong flow aeration, and the interactions between entrained air a...

Journal: :The Journal of experimental biology 2008
David A Raichlen

The dynamic similarity hypothesis (DSH) suggests that differences in animal locomotor biomechanics are due mostly to differences in size. According to the DSH, when the ratios of inertial to gravitational forces are equal between two animals that differ in size [e.g. at equal Froude numbers, where Froude = velocity2/(gravity x hip height)], their movements can be made similar by multiplying all...

2005
P. CAILLOL

This paper considers the large-scale dynamics generated in the upper atmosphere by the destabilization of a linear internal gravity wave and its eventual restabilization through nonlinear processes into a coherent pattern. The assumption of a strongly dissipative medium is relevant to wave propagation in the thermosphere range above 100 km. A parametric instability analysis is carried out invol...

سید محمد علی زمردیان, , محمدرضا باقری سبزواری, ,

The vertical pipe intake is an economical structure relative to the other alternatives. VPI usually installed near the water surface and prevents from the coarse sediment entrance to the system. The strong vortex in VPI entrance is a major problem which may reduce the system efficiency. Recognizing the vortex affected parameters, helping engineers to design anti vortex structures. In this study...

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