فهرس المقالات Finite volume method

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  1 - Modeling of pollutant transmission in rivers By using Finite volume method and ANFIS model
  عباس پارسائی محمد مهدی احمدی کوروش قادری
  Study in surface water quality is important. Rivers are one of the main sources of water supply fordrinking, agriculture and industry. Unfortunately, sometime Rivers where wastewater dischargesare considered. For this reason,the pollutant transmission in river is one of أکثر

  Study in surface water quality is important. Rivers are one of the main sources of water supply fordrinking, agriculture and industry. Unfortunately, sometime Rivers where wastewater dischargesare considered. For this reason,the pollutant transmission in river is one of the most importantproblems in Environmental Engineering. the Advection Dispersion Equation (ADE) is governedon the pollutant transport in river. this equation is partial differential equation (PDE). Thisequation is used most widely in fluid engineering spatially water engineering and in generalnamed convection equation.to Preparate computer programs that can simulate the pollutanttransmission, in addition to the used numerical method to solution of the convection equation ,thecalculation of Longitudinal Dispersion coefficient (LDC) is needed. Many empirical formulas arepresented for calculating the LDC. the assessment of this equations shows that Most of theiraccuracy is not satisfactory. Thus the use of Artificial Intelligent techniques is inevitable. In thispaper, the finite volume method is used discretiz of ADE and to estimate the diffusion coefficient,adaptive neural network (ANFIS) has been developed. the result of ANFIS model shows that Theaccuracy and performance of the model in training and testing process is very suitable. After thedevelopment of an artificial intelligence model general model was developed. the result of thefinal model tested with analytical solution of ADE and observation data of the Severn River in theUK. the final result show that performance of model is suitable.Keywords: transmission of pollutant, finite volume method, Severn river تفاصيل المقالة
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  2 - آنالیز عددی آب شیرین کن خورشیدی لوله ای به منظور بررسی تأثیر سردکننده ی موضعی بر روی تولید آن
  احسان فتوحی بافقی نادر رهبر
  آب شیرین کن های خورشیدی به دلیل استفاده از انرژی ارزان، تمیز، تجدیدپذیر و بی خطر خورشید و همچنین نداشتن هیچگونه قطعه ی متحرک و سروصدا می توانند بهترین جایگزین برای آب شیرین کن های متداول باشند. در این تحقیق با در نظر گرفتن شرایط هوای مرطوب، داخل آب شیرین کن به شبیه سازی أکثر

  آب شیرین کن های خورشیدی به دلیل استفاده از انرژی ارزان، تمیز، تجدیدپذیر و بی خطر خورشید و همچنین نداشتن هیچگونه قطعه ی متحرک و سروصدا می توانند بهترین جایگزین برای آب شیرین کن های متداول باشند. در این تحقیق با در نظر گرفتن شرایط هوای مرطوب، داخل آب شیرین کن به شبیه سازی عددی انتقال جرم و حرارت جابجایی طبیعی آرام داخل آن پرداخته شده است. معادلات سرعت-فشار، بالانس انرژی و جرم به صورت دوبعدی بیان شده و از روش حجم محدود برای حل معادلات مذکور استفاده شده است. سردکننده ی موضعی در دو نقطه ی بالا و میان پوشش دایره ای و عدد رایلی در دو مقدار 104×5 و 105×1 به منظور بررسی تأثیر آن ها بر روی خطوط جریان، دما و تمرکز ثابت و همچنین نرخ متوسط تولید آب شیرین استفاده شده است. مقایسه ی نتایج حل عددی با نتایج تحلیل تجربی پیشین نشان داد که آن ها توافق خوبی با هم دارند. همچنین نتایج شبیه سازی عددی نشان دادند که افزایش عدد رایلی و استفاده از سردکننده ی موضعی سبب افزایش نرخ متوسط تولید شده و ماکزیمم تولید آب شیرین در عدد رایلی 105×1 و قرارگرفتن سردکننده ی موضعی در بالای پوشش دایره ای می باشد. تفاصيل المقالة
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  3 - Convection in a Tilted Square Enclosure with Various Boundary Conditions and Having Heat Generating Solid Body at its Center
  Periyasamy Umadevi Nagarajan Nithyadevi
  In this study free convection flow and heat transfer of a fluid inside a tilted square enclosure having heat conducting and generating solid body positioned in the center of the enclosure with various thermal boundary conditions has been investigated numerically. The go أکثر

  In this study free convection flow and heat transfer of a fluid inside a tilted square enclosure having heat conducting and generating solid body positioned in the center of the enclosure with various thermal boundary conditions has been investigated numerically. The governing equations are transformed into non-dimensional form and the resulting partial differential equations are solved by Finite Volume Method applying power-law scheme using SIMPLE algorithm with Under-Relaxation technique. The parameters leading the problem are the aspect ratio, thermal conductivity ratio, temperature difference ratio and the angle of inclination. The effect of different thermal boundary conditions on streamlines and isotherms as well as on the rate of heat transfer on all walls of the enclosure are presented graphically. تفاصيل المقالة
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  4 - A Numerical Solution of Three-Dimensional Unsteady State Heat Equation
  Endalew Tsega
  10.30495/ijm2c.2021.684809
  Heat equation is a partial differential equation that describes the distribution of temperature (heat) in a given body over time. In this study, a finite volume based method is used to solve three-dimensional heat equation. A MATLAB code is developed to implement the nu أکثر

  Heat equation is a partial differential equation that describes the distribution of temperature (heat) in a given body over time. In this study, a finite volume based method is used to solve three-dimensional heat equation. A MATLAB code is developed to implement the numerical method in a unit cube. The stability of the numerical scheme is analysed using the Von Neumann method. An example is provided in order to demonstrate the method. The numerical solution by the method is in an excellent agreement with the exact solution for the example considered. The computational procedures used in this study can provide good insights to solve a three dimensional diffusion equation arising in many physical phenomena. تفاصيل المقالة
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  5 - Evaluating a Novel Approach of Finite Volume Method for Discretization of Seepage Equation in Embankment Dams, Case study: Sonboleroud dam
  Armin Jalalzadeh Hamid Reza Vosoughifar Kamyar Mirabi
  10.22034/ap.2018.569146.1023
  : This paper was concerned to simulate seepage phenomena (problems) via a novel approach. A high-resolution finite volume method (FVM) was employed to solve the two-dimensional (2D) seepage equations (SEs) using an unstructured grids. Voronoi mesh generation method has أکثر

  : This paper was concerned to simulate seepage phenomena (problems) via a novel approach. A high-resolution finite volume method (FVM) was employed to solve the two-dimensional (2D) seepage equations (SEs) using an unstructured grids. Voronoi mesh generation method has been exploited for grid generation method due to its special advantages. In this attempt, to reach to a proper accuracy, solving method obtained on even-odd steps was applied.The model named V-Seep (with MATLAB software) was run under different seepage conditions and then verified by comparing the model outputs with results obtained from different models and measured seepage. The Phase2-2D and Seep-W software which are based on FEM and a code based on FVM with triangular grids. Due to a precise agreement between those output and other software results, the V-Seep could be considered as a reliable method for dealing with seepage problems, especially in embankment dams. In addition, statistical observations indicated a good conformity between the V-Seep and measured data from a case study. The results indicated a higher efficiency and precision of the discrete equations resulted from the Voronoi mesh. Thus, it could be recommended to utilize the Voronoi mesh in the numerical discrete equations. تفاصيل المقالة