ansys-fluent
در نشریات گروه مکانیک-
This study tackles a complicated heat transfer problem about the cooling capability of a confined slot NEPCM-water suspension impinging jet for cooling a hot surface within the mixed convective region (with Ri = 1 and Re = 100 and 300). A NEPCM-water slurry comprises nano-sized capsules containing phase change material particles dispersed in a water-based solution. The cooling medium involves a porous metal foam (Da = 0.001), and the entire configuration is subjected to a uniform magnetic field that satisfies the laminar region (Ha = 50, λ = -75°) and electric field (between the surface and confining wall). The non-dimensional governing equations of both the fluid and electromagnetic field are solved by ANSYS Fluent. This involves implementing a nondimensionalization scheme and incorporating additional partial differential equations (PDEs) into the code. Additionally, memory allocation is optimized for efficient execution. Flow patterns, isotherms, heat capacity ratio, entropy generation components, and Bejan number are computed for both water and a 2% NEPCM-water suspension. The findings indicate that increasing the Reynolds number from 100 to 300, coupled with the introduction of electromagnetic fields (EMF) enhances Nuave by 67.1% for the NEPCM-water slurry. However, this increase in heat transfer is accompanied by a proportional rise in entropy generation under EMF at Re = 300. Interestingly, the simultaneous application of electric and magnetic fields results in a notable reduction in entropy generation, with Ngen decreasing by 35% and 14% for the NEPCM-water suspension at Re = 100 and 300, respectively, compared to pure water. Moreover, the average Bejan number (Beave) exhibits a decreasing trend with increasing Reynolds numbers, indicating a diminishing relative importance of heat transfer irreversibility. By the introduction of EMF, Beave demonstrates a 35.9% decline for NEPCM suspension at Da = 0.001 as Re increases from 100 to 300. These results underscore the complex interplay among fluid dynamics, electromagnetic fields, and entropy generation in impinging jet systems, offering effective understandings for improving heat transfer methods across many industrial applications.Keywords: EMF, Impinging Jet, Ansys Fluent, NEPCM, Mixed Convection, EHD
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The objective of this study is to create an innovative blade design that enhances the power efficiency of the Savonius rotors. This is achieved by optimizing the blade shape of the traditional Savonius rotor using the ANSYS Adjoint solver program. The results of the analysis revealed that the total pressure exerted on the optimized shape was 16 times greater than that of the traditional Savonius rotor. To compare performance metrics, the rotor with the optimized blade structure was numerically modeled alongside the traditional and Banesh-type Savonius rotors using the ANSYS Fluent program. The Dynamic Mesh 6DOF method is used in the model domain in order to simulate rotation of the rotor. The rotors were then analyzed in two different configurations: as a single-stage rotor with a phase angle of 0o, and as a three-stage rotor with a phase angle of 60o between each stage while keeping rotor height constant. The optimized blade rotor with 3 stages demonstrated superior performance with a power coefficient of 0.44, outperforming both the Banesh and traditional Savonius rotors, while also displaying power coefficient values 18.9% and 37.5% higher than the Banesh-type Savonius and traditional Savonius rotors, respectively.Keywords: Optimized Rotor Blades, ANSYS Fluent, Dynamic Mesh, Ansys Adjoint Solver, Power Coefficient
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In the present research, a hydrokinetic turbine is designed, and evaluated technically, economically and environmentally to produce power from low velocity currents. Firstly, the hydraulic characteristics of three existing canals is investigated and the blade profile for the turbine rotor is determined by using the Schmitz's theory and XFOIL software. The geometrical model is then created in the SolidWorks and simulated in the ANSYS Fluent to estimate the power generation capacity. According to the results, a correlation is proposed to estimate the power generation by the turbine in different water velocities. The results are validated with the manufacturers data. The results show that the efficiency of the proposed turbine is almost 90%, the investment payback period is only 3.1 years, with a positive net present value. Environmentally, it shows that for a 1 meter in diameter turbine and water velocity of 1.5 m/s, carbon dioxide will reduce by 0.57 tons per year. The economic and environmental benefits improve greatly at higher water velocities. The results show that the proposed hydrokinetic turbine even by working in low velocity stream can supply electricity demand of rural area near the canals for the long lifespan of the turbine which is more than 25 years.Keywords: Hydrokinetic Turbine, ANSYS-Fluent, Schmitz' S Theory, Carbon Saving, Payback Period
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Geothermal energy is one of the important sources of renewable energy, so researchers are greatly interested in this type of energy. One of the advantages of this type of energy is its use to heat or cool buildings because the ground temperature is fairly constant throughout the year. The research focuses on understanding how soil depth affects the temperature difference, the rate of heat transfer, and the overall performance of the system in Baghdad, Iraq, throughout the year by conducting a mathematical test for the ground heat exchanger and determining the number of appropriate requirements during the study to reach an equation that simulates the distribution of temperatures at depth and time. The software package (CFD ANSYS FLUENT) version 17 was used for numerical analysis. The results showed that the heat transfer rate from air to soil for cooling purposes reached its highest value of -1375 watts during July at a depth of 6 m. As for heating purposes, the maximum value during January reached 579 watts at a depth of 10 m and 499 watts at a depth of 6m. Earth air heat exchanger effectiveness was highest possible at depths of 4 and 5 m, ranging from 0.9 to 0.92 over the year. The highest value of 0.98 for the exchanger effectiveness appeared during March. The results showed good agreement between the mathematical and numerical analysis and comparison with other studies, as the percentage of deviation ranged from 1.7% to 3.6% for depths from 1 m to 10 m.Keywords: Heat Exchanger, Mathematical Model, Renewable Energy, Ground Temperature, Ansys Fluent
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منیفلد ورودی بخشی از سامانه ورودی هوا به موتور است که نقش مهمی در بهبود عملکرد از قبیل گشتاور بالا و مصرف سوخت کم و همچنین پایین نگه داشتن انتشار آلاینده ها دارد. در این تحقیق با تغییر الگوی مسیر هوا به بررسی عددی نقش آن در تنفس موتور پرداخته شده است. به همین منظور ابتدا طرح منیفلدها بصورت سه بعدی در نرم افزار SolidWorks مدل سازی شدند. همچنین دو منیفلد با هندسه های مختلف به صورت کوپل یک بعدی- سه بعدی در نرم افزارهای GT-SUITE و Ansys Fluent شبیه سازی شد. از سیال پایه هوا در این آنالیز استفاده گردید. با استفاده از روش پرینتر سه بعدی، منیفلد طراحی شده، تولید و سپس بصورت عملی آزمایش گردید. نتایج بدست آمده نشان دادند که میانگین سرعت در منیفلد بهینه شده بیشتر از منیفلد طرح موجود می باشد که این امر باعث افزایش دبی جرمی و دبی حجمی جریان خروجی می شود. همچنین، مقدار هوای مکشی برای پورت های چهارگانه در منیفلد طراحی شده توزیع یکنواخت تری پیدا کرده است. تست های عملکردی بر روی موتور، بهبود عملکردی از لحاظ افزایش توان با سوخت یکسان و کاهش آلاینده ها را با منیفلد جدید تایید می کند.
کلید واژگان: منیفلد، موتورهای دیزلی، سوخت، مکش هوا، GT-SUITE، ANSYS FluentThe intake manifold is a part of the air intake system to the engine, which plays an important role in improving performance such as high torque and low fuel consumption, as well as keeping emissions low. In this paper, by changing the pattern of the air path, its role in engine breathing has been investigated numerically. For this purpose, first, the design of the manifolds was modeled in 3D in SolidWorks software. Also, two manifolds with different geometries were simulated as a 1D-3D couple in GT-SUITE and Ansys Fluent software. Air base fluid was used in this analysis. Using the 3D printer method, the designed manifold was produced, and then practically tested. The obtained results showed that the average speed in the optimized manifold is higher than the existing manifold, which increases the mass flow rate and volume flow rate of the output flow. Also, the amount of intake air for the four ports in the designed manifold has found a more uniform distribution. Performance tests on the engine confirm the performance improvement in terms of increased power with the same fuel and reduced emissions with the new manifold.
Keywords: Manifold, Diesel Engines, Fuel, Air Intake, GT-SUITE, Ansys Fluent -
Understanding the ecological conditions of vegetation growth in water sources is vital to appraise the influence of vegetation on river engineering. Based on the experimental information that is accessible, the consequences of vegetation on flow resistance is described as an alteration in the drag coefficient and the planned area. The current study analytically estimates the vertical distribution of stream-wise velocity in open-channel flow while considering rigid and flexible vegetation. The flow is vertically separated into top free water layer and bottom vegetation layer using the projected deflection height of both vegetation. Related momentum calculations for each layer are then derived. Based on the gathered experimental data, a 3D numerical model with various simulation situations is used to model, calibrate, and evaluate the artificial cylinders. A considerable deflection analysis is utilised to calculate the velocity-dependent stem height. This has proven to be more precise compared to formerly deflection investigation. The estimated outcomes show that precise predictions may be made for the vertical contours of vertical Reynolds shear stress based on mean horizontal velocity. The numerical simulations demonstrate that plant flexibility reduces the vertical Reynolds shear stress and prompted flow resistance force of the vegetation.Keywords: Open-Channel Flow, Analytical Model, Numerical Model, Velocity Distribution, ANSYS Fluent, 3D Simulation
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Modeling efforts on turbulent gas-solid flows have mainly focused on studying particle-laden flows in channels and pipes. Despite its significance for industrial applications, the study of gas-solid flows in sudden or gradual expansions is less common in the literature. This paper challenges current two-phase flow models to compute the dilute turbulent gas-solid flow in a vertically oriented 12° conical diffuser. The solids phase is modeled in two ways: the Two-Fluid Model approach that incorporates closure relations derived from the kinetic theory of granular flow, and the Euler-Lagrange particle tracking model with two-way coupling. In both cases, turbulence in the gas phase is estimated by the Reynolds stress model with additional modulation terms that account for the effect of the particles on the gas-phase turbulence. Simulation results are validated versus experimental benchmark data not only for gas axial velocity but also for streamwise and radial turbulence intensity, as comparison with such turbulent variables has not been detailed in previous studies. Nevertheless, due to the lack of experimental data for validation, profiles of solids axial velocity are only compared numerically. Contours of turbulence kinetic energy and granular temperature in the diffuser region reveal a high shear area responsible for the production of turbulence in both phases. Moreover, results obtained from the Euler-Lagrange model show an intense particle fluctuating velocity in the streamwise direction downstream of the diffuser.Keywords: Two-fluid model, Kinetic theory of granular flow, Two-way coupling, Turbulence modulation, ANSYS-Fluent
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تامین آب شیرین همواره یکی از مهم ترین مسایل پیش روی انسان است. باتوجه به جمعیت و منابع آب موجود، روش های مختلفی برای تامین آب ارایه می شود، در این مقاله به بررسی یکی از این روش ها پرداخته می شود. در این روش هوا از طریق فن های ورودی وارد لوله های زیرزمینی شده و از طریق این لوله ها وارد برج خنک کن می شود. با کاهش دمای هوا از طریق خنک کاری، آب اضافی موجود در هوای مرطوب از حالت بخار به مایع تبدیل می شود. از آب حاصل می توان به عنوان آب شرب و یا برای مصارف کشاورزی استفاده کرد. شبیه سازی عددی این سامانه برای حالت های مختلف با استفاده نرم افزار انسیس فلوینت برای هر قسمت از فرایند به صورت مجزا انجام می گیرد. باتوجه به نتایج حل عددی، با استفاده از روابط تهویه مطبوع نرخ استحصال آب محاسبه می شود. در نیمه ابتدایی روز نرخ استحصال آب مقدار قابل توجهی است. این مقدار در نیمه دوم روز به صفر می رسد. علت این امر، بالاتر بودن دمای بدنه برج نسبت به هوای ورودی است. با این فرض در نیمه دوم روز، هوای ورودی وظیفه خنک کاری سیکل و آماده سازی آن برای روز بعد را برعهده دارد.کلید واژگان: هوای مرطوب، برج خنک کن، استحصال آب، حل عددی، آب اتمسفریکWater crisis and providing water is one of the most important problems that humans are facing. There are several ways for water extraction, depending on population and resources. In this simulation, water is extracted by a cooling tower from humid air. Humid air enters the buried pipes with fans. Then the air reaches the cooling tower. Because of the difference in temperature between air and pipes, air temperature decreases. After this process, there is an amount of water extracted from humid air. The extracted water can be used as drinkable water or for agricultural purposes. In this project, we simulate air flow by Ansys Fluent. Then, by using air condition formulas, combined with the numerical solution, the amount of extracted water can be calculated. In addition, in the first hours of the day, because the temperature difference is more than at the end of the day, the amount of extracted water is different throughout a day. We can find out that in the second half of the day, the air is cooler than the tower, so the air is cooling the tower and preparing the system for the next day.Keywords: Humid Air, Cooling tower, Atmospheric Water Generator, Ansys Fluent
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The Dual Bell Nozzle is the most ambitious of several supersonic, altitude-compensating nozzle concepts for rocket engines. This design's objective is to enhance performance in two different evolving regimes (Sea-Level and High Altitude Mode) by self-adaptation with no mechanical control. The concept is simple in theory, but the structural efforts involved are significant. The study carried out in this paper is a simulation of the flows in this type of nozzle. Computational fluid dynamics (CFD) is increasingly used as an analytical tool in research and industry. Simulation is not a substitute for experimentation but a complement to it; it allows the analysis of the problem in real conditions (reproduce tests that are done in experimentation to better understand them and at lower cost) or, on the contrary, in extreme or marginal test conditions (extreme climates, installation defects, etc.). Through simulation, the studied system becomes more flexible. We can easily make parametric studies. Simulation almost always takes the form of a program or computer tool. These are commonly called simulation environments. Developments and progress over the past two decades have led to the emergence of a methodology that has become standard. As for any complex system, the control of a phenomenon is based on the identification and modularization of the tasks. Currently, the standard methodology divides the simulation process into four distinct tasks: geometric modeling, meshing, solving, and finally analysis and visualization. In this study, we will present a test case used to validate our computational models that will be used to optimize the profile of a dual bell nozzle. We will use the Ansys-ICEM environment to generate the meshes and the Ansys-Fluent environment to solve the equations of our models. Our results will then be compared with experimental and numerical data from our literature review.Keywords: CFD, Prandtl-Meyer expansion fan, ANSYS-Fluent, Supersonic flow, Method of characteristics (MOC)
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The land needed to install wind turbines is shrinking as power generation from renewable energy sources increases significantly. A large number of studies are being conducted to maximize the power extraction from wind turbines in areas with low wind speeds. Wind turbine blades play a significant role in utilizing the maximum amount of energy from the wind. The aerodynamic performance of a wind turbine blade depends on the airfoil shape. The shape optimization of an asymmetric S2027 airfoil for a low wind speed region was investigated using the adjoint-based optimization technique. The primary objectives of this study were to maximize the lift coefficient, minimize the drag coefficient, and maximize the lift-to-drag ratio. The optimization is based on the adjoint method for Reynolds number variation in the range of 2 × 105 to 5 × 105 and an angle of attack variation from 0° to 12°. A two-dimensional Reynolds–Averaged Navier–Strokes Computational Fluid Dynamics model was created with all the operating parameters and used for optimization. The aerodynamic performance was validated experimentally. For each optimization function, approximately 16 shapes were obtained. The aerodynamic performance for each optimized shape was determined under different operating conditions. Different airfoil shapes with a specific chord, leading and trailing edges, and span arrangement was obtained. The drag coefficient was reduced by 2%–30%; the lift coefficient was improved by 2%–35%, and the lift-to-drag ratio was improved up to 40%.Keywords: Airfoil shape optimization, Wind turbine blade, XFOIL, ANSYS Fluent, Numerical Simulation Wind tunnel
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The spillways of hydraulic structures transfer excessive water from dam reservoir to the downstream in a safe and controlled manner. A labyrinth or triangular weir is a flat spillway folded in plain view. The labyrinth weirs provide an increase in crest length for a given channel width and increase the flow capacity for a given weir load. As a result of the increased flow capacity, the labyrinth and triangular weirs require less space in the dam body than the flat weirs. In this study, experiments were carried out on the labyrinth weirs containing triangles of different heights and numbers by using 3 different weir heights (P=20cm, 30cm, and 40 cm) and 4 different weir shapes. Each experiment was repeated for 30 different discharge values. The effects of weir height and weir shape on the total head over the weir (HT) and discharge (Q) were investigated. In addition, the numerical models of all experimental setups were created by ANSYS-Fluent program using Computational Fluid Dynamics (CFD). By comparing the results obtained from the numerical models with the physical models, the accuracy of the numerical models was tested. According to the results, as the number of the triangles (N) of the weir increases, the discharge coefficient (Cd) decreases. The weir height (P) does not have a major effect on the discharge.Keywords: ANSYS-FLUENT, CFD, Labyrinth weirs, Triangular sectioned weirs, Spillways
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Air conditioning is widely used in many areas to reduce the heat and humidity of the work place and to maintain a room temperature for thermal stability and physical ability to perform various tasks. Computational Fluid Dynamics (CFD) is based on the numerical solutions of the fundamental governing equations of fluid dynamics namely the continuity, momentum and energy equations. Computerized fluent mechanics is one of the increasing paradigm in the air flow simulation in vehicle designs. The design optimization of vehicle can offer better efficiency in cabin surface as well as aerodynamic. In vehicles, air conditioning tends to offer efficient thermal conditioning and air circulation inside the cabin for passenger comfort from different climate variation. Almost all the automobiles available in the market are fitted with air-conditioning systems. The manufacturers focus clearly on the AC system for a wide variety of climates. As technology advances, AC system is also adhering major advancements. In general, automobile air-conditioning systems are designed to provide comfort for the driver and the passengers during a journey. The conventional electrical-driven compression systems are widely used in almost all of the automobiles today. An air-conditioner is operated to make a hot and humid passenger compartment a more comfortable environment. However, with the improvement in vehicle fuel economy, the allowable power consumption for the air-conditioner has been decreasing, in relation to the overall power consumption of the vehicle. The internal temperature-humidity conditions are an essential factor for the comfort and health of passengers, and also for the safety of drivers. In this research, the air conditioning inside vehicle cabin is analyzed. The objective of the research is to develop an air depression design inside the top surfaces of the rear cabin. The optimal flow of air inside cabin increases the thermal comfort of the vehicle. The proposed cabin depression design inside the rear top surfaces are analyzed under thermal variation and airflow circulation inside the cabin. The Ansys fluent tool is utilized in this paper to evaluate the variation of air flow and the temperature inside the passenger vehicle cabin respectively. From the research analysis, the proposed evaluation of the depression design is more optimal for air conditioning in budgetary small passenger vehicles.Keywords: Automobile, Air conditioning, Humidity, Air duct, Temperature, Vehicle cabin, ANSYS Fluent
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The integrated circuits face a huge issue to meet out the cooling demand due to the rapid development in technology. Several researchers have investigated the different possibility of cooling medium to improve the heat dissipation in an integrated circuits. Heat sink is a kind of thermal heat transfer device used to dissipate heat from an integrated circuit (IC) to surrounding due to low cost and reliability in heat dissipation. In this numerically work, the electronic chip with the heat sink is analyzed to study about the cooling rate, surface temperature of the chip, reliability and power dissipation of the chip with different heat transfer medium, fin height and fin thickness. The different heat transfer medium is air, water and engine oil. The ANSYS (v12) fluent software is used to study numerically about the electronic chip cooling. In this research work, the heat transfer rate of water is 9.5% greater than air and 1.4% than engine oil at the same Reynolds number is obtained. The power dissipation is increases up to 1.45% of the fin height 55mm and heat transfer rate is enhanced by increasing the fin thickness up to 2.10% in 6mm. However, the lifetime of the electronic chip with fin height 55mm is 2.06% hrs (day) greater than the fin with 35mm. It is observed that the electronic chip with water as a heat transfer medium with proper fin height and thickness is highly reliable to enhance the heat transfer than that of air and engine oil.Keywords: ANSYS-Fluent, Heat sink, Nusselt number, Fin height
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