Accuracy of boundary layer treatments at different Reynolds scales
| Autor: | Angel N. Menéndez, Nicolás D. Badano |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Environmental Engineering
scale effects 0208 environmental biotechnology Aerospace Engineering 02 engineering and technology Computational fluid dynamics 01 natural sciences 010305 fluids & plasmas Physics::Fluid Dynamics wall treatments 0103 physical sciences General Materials Science Electrical and Electronic Engineering cfd physical models Civil and Structural Engineering Physical model business.industry Mechanical Engineering Mechanics Engineering (General). Civil engineering (General) rans models 020801 environmental engineering Boundary layer Scale effects TA1-2040 business Geology |
| Zdroj: | Open Engineering, Vol 10, Iss 1, Pp 295-310 (2020) |
| ISSN: | 2391-5439 |
| Popis: | Resistive forces associated to boundary layers (‘friction’) are usually out of scale in physical models of hydraulic structures, especially in the case of hydraulically smooth walls, generating distortions in the model results known as scale effects, that can be problematic in some relevant engineering problems. These scale effects can be quantified and corrected using suitable numerical models. In this paper the accuracy of using numerical simulation through the Reynolds Averaged Navier-Stokes (RANS) approximation in order to represent the head losses introduced by friction in hydraulically smooth walls is evaluated for a wide range of Reynolds scales. This is performed by comparing the numerical results for fully developed flow on circular pipes and between parallel plates against experimental results, using the most popular wall treatments. The associated numerical errors, mesh requirements and ranges of application are established for each treatment. It is shown that, when properly applied, RANS models are able to simulate the head losses produced by smooth wall friction accurately enough as to quantify the scale effects present in physical models. A methodology for upscaling physical model results to prototype scale, free of scale effects, is proposed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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