شبیه‌سازی باد در یک منطقه کوهستانی فوق پیچیده به روش پیش‌بینی عددی هوا با دقت بسیار بالا و با استفاده از روش شبیه‌سازی گردابه‌‌های بزرگ

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه شهید بهشتی، دانشکده مکانیک و انرژی، دانشجوی بین دانشگاهی با دانشگاه ای پی اف ال.

2 دانشکده مهندسی مکانیک و انرژی، دانشگاه شهید بهشتی، تهران، ایران

چکیده

پتانسیل‌‌سنجی انرژی باد در مناطق کوهستانی با استفاده از روش پیش‌‌بینی هوای عددی مورد توجه محققان قرار گرفته‌است. در این پژوهش به کمک این روش، باد در مارتینی در کشور سوئیس شبیه‌‌سازی شده‌‌است. این شبیه‌‌سازی دارای دقت افقی بسیار بالا (100متر) بوده که امکان استفاده از روش شبیه‌‌سازی گردابه‌‌های بزرگ را فراهم می‌کند. هدف از انجام این پژوهش بررسی میزان موفقیت مدل در شبیه‌‌سازی باد و اثر افزایش دقت عمودی و استفاده از دو مدل توربولانسی مقیاس زیر شبکه اسماگورینسکی و مدل انرژی جنبشی توربولانسی 1/5 بوده‌است. نتایج نشان می‌‌دهد که مدل به خوبی قادر به شبیه‌سازی باد در مقایسه با داده‌‌های دریافتی از ایستگاه‌‌های اندازه‌‌گیری بوده و الگوی روزانه باد را به خوبی تولید کرده‌است. در منطقه‌‌ای که درون دره‌‌ای عریض و هموار قرار گرفته، دقت نتایج بسیار بالا بوده ولی در قله کوه‌‌ها خطای اندازه سرعت باد زیاد بوده‌است. در زمان وقوع بیشینه سرعت باد در قله کوه‌ها، با تغییر مدل توربولانسی مقیاس زیرشبکه از اسماگورینسکی سه بعدی به مدل انرژی جنبشی توربولانسی 1/5، خطا از 22 به 17 متر بر ثانیه و سپس با کاهش ارتفاع عمودی سلول‌ها از 47 متر به 37 متر، خطا از 17 به 7 متر برثانیه کاهش یافته‌است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Wind simulation in a complex terrain by numerical weather prediction method using large eddy simulation

نویسندگان [English]

  • Shokoufeh Malek Mohamadi 1
  • Pooyan Hashemi Tari 2
1 Department of Mechanical and Energy Engineering, Shahid Beheshti University, Exchange student with EPFL in Switzerland.
2 Department of Mechanical and Energy Engineering, Shahid Beheshti University, Tehran, Iran
چکیده [English]

Researchers are interested in wind resource assessment studies for mountainous terrains using numerical weather prediction methods. In present study the wind over Martigny located in Switzerland has been simulated using weather research and forecasting model. Due to high resolution of the simulation (100 m), large eddy simulation is employed to perform turbulence modeling. The objective of this study is to assess the credibility of model in wind simulation and to examine the effect resolution and two different sub-grid scale turbulence models. The results reveal that model is able to properly generate the wind in comparison with the data obtained from wind measurement stations. The results also show a promising simulation for the region, located within a wide and flat valley. However, the discrepancies between the results and those obtained from the wind station are bold for regions at mountainous peaks. At the time at which the maximum wind speed occurs, it is found that the wind error decreases from 22m/s to 17m/s by changing the sub-grid scale model from Smagronisnky3D to turbulence kinetic energy 1.5 model. Also, the predicted wind speed declines from 17m/s to 7m/s by reducing the vertical size of the grid cells.

کلیدواژه‌ها [English]

  • Wind
  • Numerical weather prediction
  • Weather research and forecasting
  • Large eddy simulation
  • Wind resource assessment

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نشریه مهندسی مکانیک امیرکبیر
دوره 53، شماره 7
مهر 1400
صفحه 4221-4240

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