منابع مشابه
Numerical Simulation of Unsteady Low-Reynolds-Number Separated Flows over Airfoils
boundary-layeredge is still slightly freestreamdependent, the level of eddy viscosity and therefore also the skin-friction coef cient are not. Furthermore, the velocity distribution is consistent with the law-of-the-wall solution. As a second test case, the RAE2822 airfoil is considered (in particular, case 9 of Ref. 11). Figure 2 compares the pressure and skinfriction distributions of the dif...
متن کاملBoundary Layer Trips on Airfoils at Low Reynolds Numbers
Three categories of boundary layer trips (single 2-D plain. multiple 2-D plain, and 3-D trips) were tested on the l\106-13-128, E374, and SD7037 airfoils over t he Reynolds numbers of 100,000 to 300,000. Flow visualization and drag data were acquired for a number of trip heights and locations. To facilitate comparisons between airfoils, t rips were located relative to untripped laminar separati...
متن کاملComputation of Airfoils at Very Low Reynolds Numbers
We discuss a new numerical scheme involving adaptive boundary conditions which allows to compute, at very low Reynolds numbers, drag and lift of airfoils with rough surfaces efficiently with great precision. As an example we present the numerical implementation for an airfoil consisting of a line segment. The solution of the NavierStokes equations is singular at the leading and the trailing edg...
متن کاملStochastic low Reynolds number swimmers.
As technological advances allow us to fabricate smaller autonomous self-propelled devices, it is clear that at some point directed propulsion could not come from pre-specified deterministic periodic deformation of the swimmer's body and we need to develop strategies for extracting a net directed motion from a series of random transitions in the conformation space of the swimmer. We present a th...
متن کاملLow-Reynolds-number swimming at pycnoclines.
Microorganisms play pivotal functions in the trophic dynamics and biogeochemistry of aquatic ecosystems. Their concentrations and activities often peak at localized hotspots, an important example of which are pycnoclines, where water density increases sharply with depth due to gradients in temperature or salinity. At pycnoclines organisms are exposed to different environmental conditions compar...
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ژورنال
عنوان ژورنال: Journal of Aircraft
سال: 2019
ISSN: 1533-3868
DOI: 10.2514/1.c035515