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Simulation Of Natural Convection Of Air In A Square Cavity Using The Gothic Thermal Hydraulic Code
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Book Synopsis Simulation of natural convection of air in a square cavity using the gothic thermal-hydraulic code by : M. F. Lightstone
Download or read book Simulation of natural convection of air in a square cavity using the gothic thermal-hydraulic code written by M. F. Lightstone and published by . This book was released on 1993 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Safety, Reliability and Risk Analysis by : Sebastian Martorell
Download or read book Safety, Reliability and Risk Analysis written by Sebastian Martorell and published by CRC Press. This book was released on 2008-09-10 with total page 3512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Safety, Reliability and Risk Analysis. Theory, Methods and Applications contains the papers presented at the joint ESREL (European Safety and Reliability) and SRA-Europe (Society for Risk Analysis Europe) Conference (Valencia, Spain, 22-25 September 2008). The book covers a wide range of topics, including: Accident and Incident Investigation; Crisi
Book Synopsis Natural Convection of Air in a Square Cavity by : Graham De Vahl Davis
Download or read book Natural Convection of Air in a Square Cavity written by Graham De Vahl Davis and published by . This book was released on 1981 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of Heat Transfer written by and published by . This book was released on 2005 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Natural Convection of Air in a Square Cavity by : Graham De Vahl Davis
Download or read book Natural Convection of Air in a Square Cavity written by Graham De Vahl Davis and published by . This book was released on 1982 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Natural Convection in a Square Cavity by : Graham De Vahl Davis
Download or read book Natural Convection in a Square Cavity written by Graham De Vahl Davis and published by . This book was released on 1982 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Study of Natural Convection Instabilities in Closed Cavities with Non-isothermal Walls by : Sneha Rajeev Sondur
Download or read book Study of Natural Convection Instabilities in Closed Cavities with Non-isothermal Walls written by Sneha Rajeev Sondur and published by . This book was released on 2020 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Natural convection inside closed cavities has been investigated extensively over the years owing to its application in several industrial processes. Amongst these, the most commonly studied configuration is that of natural convection in air-filled cavities with isothermal vertical walls maintained at different temperatures, which promote a unicellular base air-flow pattern. In the present work, natural convection of air in annular and rectangular cavities with non-isothermal walls supporting a bi-cellular base air-flow pattern is explored both experimentally and numerically. The experiments and numerical studies described in this work represent a significant departure from the more familiar problem of stability of unicellular convection in closed cavities and are therefore a novel addition to the body of literature available for natural convection systems. Two experimental systems, one annular and one rectangular were constructed to study the stability of natural convection in tall, closed air-filled cavities with non-isothermal walls. The thermal boundary conditions applied on the cavities' vertical walls were such that the temperature of one vertical wall was higher than that of the opposing wall in the top portion of the cavity and lower than it in the bottom portion of the cavity. The Rayleigh number or buoyant potential of the bi-cellular (base) air-flow was successively increased/decreased over the course of several experiments, and the stability of flow inside these cavities was studied via monitoring of air temperatures. At low Rayleigh numbers, a steady flow regime was observed for both annular and rectangular cavities. With an increase in Rayleigh number transitions to 3D asymmetric periodic flows, quasi-periodic flows, intermittent flows, and chaotic flows were observed for the annular cavity. On the other hand, transitions from steady to 2D periodic flow, then to 3D periodic flow and finally to chaotic flow were observed for the rectangular cavity. The observed flow bifurcations, the resultant oscillation frequencies, phases, and amplitudes mapped relative to the wall thermal boundary conditions for both annular and rectangular experimental systems are presented in this work. 2D and 3D CFD models of the two experimental systems were developed using the commercial CFD code Simcenter StarCCM+ in order to numerically predict the experimentally observed unsteady natural convection flows. The experimentally imposed thermal boundary conditions were used as inputs for the CFD models. The accuracy of these CFD models in predicting experimental flows is discussed, and comparisons are made between the prediction capabilities of the 2D and 3D CFD models. Furthermore, the numerical simulations and frequency analysis of the experimental data are able to shed light on the primary instability modes causing the transitions from steady to unsteady flows. These instability mechanisms responsible for bifurcations observed in the annular and rectangular cavity are discussed in detail. This work also includes a benchmarking exercise for the commercial CFD code Simcenter StarCCM+ for problems of natural convection in cavities under both Boussinesq and non-Boussinesq temperature conditions. In addition, numerical simulations to understand the impact of non-Boussinesq temperature conditions and variable thermophysical fluid properties on the natural convection instabilities observed in closed, tall, air-filled rectangular and annular cavities with isothermal walls are performed.
Book Synopsis Low Turbulence Natural Convection in an Air Filled Square Cavity by : Yongsheng Tian
Download or read book Low Turbulence Natural Convection in an Air Filled Square Cavity written by Yongsheng Tian and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Turbulent Natural Convection in a Differentially Heated Square Cavity by : Warit Chanprasert
Download or read book Turbulent Natural Convection in a Differentially Heated Square Cavity written by Warit Chanprasert and published by . This book was released on 2018 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: Natural convection in a side or differentially heated cavity is a classical problem in heat transfer. The problem represents a wide range of engineering applications and has also been commonly used as a benchmark problem for validating Computational Fluid Dynamics (CFD) computer programs. This study investigates turbulent natural convection of a fluid with a Prandtl number of 0.71 in a differentially heated square cavity with adiabatic top and bottom walls. Two different boundary conditions are applied to the side walls; (1) the standard isothermal side wall problem, and (2) the mixed isoflux/isothermal problem, which has a constant heat flux on the heated side wall with an isothermal cold wall on the opposite side. An experimental study is carried out to determine the net convective heat transfer between isothermal hot and cold walls for a range of wall temperature differences in the laminar flow regime. The experiment data is compared with CFD predictions, and they are found to be in reasonable agreement......
Book Synopsis Turbulent Natural Convection in an Air Filled Standard Or Partitioned Square Cavity by : Felix Ampofo
Download or read book Turbulent Natural Convection in an Air Filled Standard Or Partitioned Square Cavity written by Felix Ampofo and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Investigation of Natural Convection and Entropy Generation of Water Near Density Inversion in a Cavity Having Circular and Elliptical Body by : Nguyen Minh Phu
Download or read book Numerical Investigation of Natural Convection and Entropy Generation of Water Near Density Inversion in a Cavity Having Circular and Elliptical Body written by Nguyen Minh Phu and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this chapter, a water-filled square cavity with left hot wall and right cold wall was numerically investigated. The hot and cold wall temperatures are 10¬∞C and 0¬∞C respectively to examine the density inversion of natural convection water, i.e. water at 4¬∞C. In the middle of the square, there are circular and elliptical bodies to study fluid,Äìstructure interaction in terms of the thermohydraulic behavior and entropy generation. 2D numerical simulation was performed using finite volume method in Ansys fluent software with the assumption of laminar flow. The simulation results are compared with benchmark data to determine reliability. The results indicate that the body insertions increase the convection heat transfer coefficients at the best heat transfer positions due to impingement heat transfer. An increase in heat transfer rate of 1.06 times is observed in the case of circular body compared to none. There are three primary eddies in the cavity with bodies, whereas the cavity without body has two primary eddies. Maximum entropy generation was found in the upper right corner of cavity mainly due to high horizontal temperature gradient. Bodies of circle and vertical ellipse have almost the same thermohydraulic and entropy generation characteristics due to the same horizontal dimension which mainly effects on the downward natural convection current. The entropy generation of cavity with circular body is 1.23 times higher than that of the cavity without body. At positions y/L¬†=¬†1 on the hot wall and y/L¬†=¬†0.74 on the cold wall, the convection heat transfer coefficient is close to zero due to stagnant fluid.
Book Synopsis Natural Convection From An Open Rectangular Cavity With Cylinder by : Sheikh Anwar Hossain
Download or read book Natural Convection From An Open Rectangular Cavity With Cylinder written by Sheikh Anwar Hossain and published by LAP Lambert Academic Publishing. This book was released on 2012 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Finite Element Simulation of two-dimensional laminar steady state natural convection in a rectangular open cavity has been studied. A heated circular cylinder is placed at the centre of the cavity where the left sidewall to the cavity is heated by a constant heat flux. The top wall is kept cool and the bottom wall is kept at a hot temperature. The fluid is concerned with different Prandtl numbers. The properties of the fluid are assumed to be constant. The physical problems are represented mathematically by different sets of governing equations along with the corresponding boundary conditions. In this study, finite element method for steady state incompressible natural convection flows is used to find the numerical results. The Galerkin Weighted Residual method of finite element formulation is applied to discretize the non-dimensional governing equations. The results of the investigation are obtained in terms of streamlines, isotherms and heat transfer characteristics Nusselt numbers for different Grashof numbers and different inclination angles of the cavity ranges from 0o to 45o.
Book Synopsis Numerical Simulation of Natural Convection in Cavities Using the Finite Analytic Method by :
Download or read book Numerical Simulation of Natural Convection in Cavities Using the Finite Analytic Method written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A numerical study of natural convection in a square cavity by : K. H. Winters
Download or read book A numerical study of natural convection in a square cavity written by K. H. Winters and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Computational Fluid Dynamics (CFD) Modeling of Mixed Convection Flows in Building Enclosures by : Alexander Kayne
Download or read book Computational Fluid Dynamics (CFD) Modeling of Mixed Convection Flows in Building Enclosures written by Alexander Kayne and published by . This book was released on 2012 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years Computational Fluid Dynamics (CFD) simulations are increasingly used to model the air circulation and temperature environment inside the rooms of residential and office buildings to gain insight into the relative energy consumptions of various HVAC systems for cooling/heating for climate control and thermal comfort. This requires accurate simulation of turbulent flow and heat transfer for various types of ventilation systems using the Reynolds-Averaged Navier-Stokes (RANS) equations of fluid dynamics. Large Eddy Simulation (LES) or Direct Numerical Simulation (DNS) of Navier-Stokes equations is computationally intensive and expensive for simulations of this kind. As a result, vast majority of CFD simulations employ RANS equations in conjunction with a turbulence model. In order to assess the modeling requirements (mesh, numerical algorithm, turbulence model etc.) for accurate simulations, it is critical to validate the calculations against the experimental data. For this purpose, we use three well known benchmark validation cases, one for natural convection in 2-D closed vertical cavity, second for forced convection in a 2-D rectangular cavity and the third for mixed convection in a 2-D square cavity. The simulations are performed on a number of meshes of different density using a number of turbulence models. It is found that k-[epsilon] two-equation turbulence model with a second-order algorithm on a reasonable mesh gives the best results. This information is then used to determine the modeling requirements (mesh, numerical algorithm, turbulence model etc.) for flows in 3D enclosures with different ventilation systems. In particular two cases are considered for which the experimental data is available. These cases are (1) air flow and heat transfer in a naturally ventilated room and (2) airflow and temperature distribution in an atrium. Good agreement with the experimental data and computations of other investigators is obtained.
Book Synopsis A Computer Code for Natural Convection in an Enclosed Cavity with a Free Surface by : Jean Maquet
Download or read book A Computer Code for Natural Convection in an Enclosed Cavity with a Free Surface written by Jean Maquet and published by . This book was released on 1987 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Simulation of Natural Convection in Closed Containers Using a Fully Implicit Method by :
Download or read book Numerical Simulation of Natural Convection in Closed Containers Using a Fully Implicit Method written by and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerical solutions have been obtained for two-dimensional free convective flow in rectangular and annular cavities using the strongly implicit procedure (SIP) and the cyclic reduction-fast Fourier transform (CR-FFT) technique. Rayleigh numbers range from 104 to 106, Prandtl numbers from 0.713 to 103, radius ratios from 1 to 3 (annular cavities), and aspect ratios (height/width) from 1 to 15. Motion is generated by either uniformly heating the bottom wall or heating a vertical wall (nondimensional temperature of 1) and cooling the opposite wall (nondimensional temperature of 0). Both time-dependent and steady state solutions confirm results previously obtained by others. The computational speed of the SIP and CR-FFT methods is very fast. Because SIP uses a common set of matrix algorithms, the governing equations of motion can be solved simultaneously without major modification to the method for each equation.
