توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Extension of an integrated AHP and TOPSIS approach in water resources management
نویسنده(ها): ، ،
اطلاعات انتشار: نهمین سمینار بین المللی مهندسی رودخانه، سال
تعداد صفحات: ۹
This study aims to develop MCDM approach in water resources management, for this purpose an integrated AHP and TOPSIS approach was applied in the Harsin earth dam site selection at the western part of Iran. To do this, firstly the influential criteria for locating the earth dam site were determined using comprehensive literature review and the opinions of experts. Then, some watersheds in the surrounding areas of Iran’s Harsin city were studied and four feasible sites proposed. In the final stage, these sites were prioritized using this proposed approach, and the most optimal site was selected. AHP was used to determine the relative weight of criteria and TOPSIS was used to rank alternatives.<\div>

۲Bathymetery and flow numerical simulation in curved channels by adjusting the different passing discharge of flow
اطلاعات انتشار: دهمین کنگره بین المللی مهندسی عمران، سال
تعداد صفحات: ۱۰
The bend presence caused changes in flow patterns. In the present study, using Fluent software, flow pattern and bathymetery simulated in 120° sharp bend in the four different discharges. For verification of the numerical model, first, a 90° sharp bend is simulated and compared with available experimental results. Then 120°bend will be evaluated. In curved channels, with increasing discharge of flow, the superelevation percentage of the water surface in the section located before the bend is decreasing. In the 60° cross section, the dimensionless amount of changes in water level, in discharge 4.5, 9, 12 and 15 liter per second, are respectively, 0.109, 0.108, 0.09 and 0.079 that with the discharge increasing, are ascending. In the interior sections of the bend, the transverse slope of the water surface in the inner half–width always is greater than outer half–width of the channel, So this slope is non–linear in sharp bends.<\div>

۳Comparison and numerical and experimental study of flow patterns in sharp bends
اطلاعات انتشار: دهمین کنگره بین المللی مهندسی عمران، سال
تعداد صفحات: ۱۰
Study of flow pattern in sharp bends is so important because of the complexity of the flow pattern in this bends in to mild bends. In this study, the numerical study of flow pattern in three sharp bends 90°, 120° and 180° have been done. Corresponding numerical model is based on the Fluent software with free surface model. And the k  (RNG) turbulence model is used to simulate turbulent flow parameters. The results show that the overall pattern of velocity distribution for the three bends have been studied are identical. In this bends, maximum velocity until around the end of the bend is located in the inner wall and is transmitted to the outer wall in the sections located after the bend. Study area tends to flow separation in the inner wall in the ending section of the bend indicates that by increasing the angle of curvature of the bend, bending effect on the tendency to flow separation within the channel width is increase. The shear stress distribution pattern at each three bend is identical and similar to the velocity pattern.<\div>

۴Comparison of VOF and Mixture models in numerical simulation of flow patterns in curved channels
اطلاعات انتشار: دهمین کنگره بین المللی مهندسی عمران، سال
تعداد صفحات: ۹
In this study, free surface and pattern of Flow through a 90° sharp bend, Using FLUENT software, and utilizes both VOF and Mixture models with k  (RNG) turbulence model have been simulated. To verify the numerical models, experimental results conducted in this research is used. The results indicate that both models are well able to predict the flow pattern of the bend. But the VOF models with an 0.03 average error reffer to the Mixture model with 0.125 Average error to better fit with the experimental results<\div>

۵Numerical Analysis and Perdiction of The Mean Velocity in The Intake and Rivers Using Artificial Neural Networks (ANN) andANSYS–CFX
نویسنده(ها): ، ،
اطلاعات انتشار: کنفرانس بین المللی علوم، مهندسی و فناوری های محیط زیست، سال
تعداد صفحات: ۱۴
The simplest method of deviating water in irrigation systems, agriculture is using dividing flow channels. Intake is considered a type of dividing flow channel. One of the essential hydraulic parameters in intake efficiency increase is measuring the mean velocity in intake. The mean velocity in an intake is predicted using ANNMLP neural network model for the ratio of different widths (w) in this study. To accomplish that the flow field was first threedimensionallysimulated through using ANSYS–CFX software in an intake with 90 degrees of diversion and then the flow mean velocity is predicted through using numerical model and the artificial neural network ANNMLP. The artificial neural network used includes 4 inputs, (y*oordinates, the ratio of the branch channel width to the main channel (w) and linear mean velocity which has been measured by numerical modelsin two different places of the intake channel (v*line 1and v*line 2). The results form comparing the numerical results and the experimental results indicated the proper accuracy of the numerical model in predicting the flow field specification in the intake and comparing the results from the predictions made by ANN–MLP model with the experimental results shows the acceptable accuracy of the artificial neural network in predicting mean velocity of flow in the intakes and for different width ratios<\div>
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