دانلود رایگان مقاله لاتین توزیع تنش برشی در سطح موج دار شدن شن از سایت الزویر
عنوان فارسی مقاله:
مطالعه عددی توزیع تنش برشی در سطح موج دار شدن شن و ماسه در جریان تونل بادی
عنوان انگلیسی مقاله:
Numerical study of shear stress distribution at sand ripple surface in wind tunnel flow
سال انتشار : 2016
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بخشی از مقاله انگلیسی:
2. Numerical model
For this numerical study we use ANSYS Fluent (see ANSYS Manual, http://www.ansys.com/Support/Documentation). The details of the implementation of the numerical code are elaborated in the following subsections. 2.1. Geometry and meshing We considered a two-dimensional (2D) rectangular control volume whose height corresponds to the wind tunnel experiment and equals 0.7 m. The width of the control volume (i.e. the length in the dimension parallel to the shearing flow) of 1.063 m was chosen such that it is short enough to be numerically efficient with reasonably fine mesh while long enough to ensure that the mean flow and the small-scale flow features in the vicinity of the ripples do not change appreciably along the direction of the flow. The upper boundary of the control volume is a non-moving smooth wall, while the bottom is a non-moving wavy wall shaped by a periodic pattern of ripples. The basic form of a ripple is asymmetric and shown in Fig. 2a and b and its shape was taken from a previous wind tunnel study (Schmerler et al., 2015, see Table 1 which summarizes the ripples morphology in the experiments). The inlet boundary condition is posed at the left boundary of the control volume while the outlet boundary condition is posed at the right boundary of the control volume. In constructing the mesh we used an adaptive mesh which is refined in the vicinity of the wavy wall in order to capture fine features of the flow (see Fig. 2c). General view of the control volume geometry and the mesh are shown in Fig. 3.
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