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Increasing Ejector Efficiency via Diffuser Shape Optimization
Kubíčková, Lucie ; Isoz, Martin ; Haidl, Jan
An ejector is a technologically simple and yet wide-application fluid machine. While it has favorable characteristics for a signifficant number of technological processes, its main downside is probably its high operational energy demands. The present paper is an initial result of an ongoing research aimed at improving energy e ciency of the ejector via optimization of its geometry. In the paper, we focus mostly on presenting a general multi-objective optimization framework usable for an ejector shape optimization. The approach applicability is illustrated on a simpli ed problem comprising only a single phase flow in an ejector mixing tube and diffuser. Nevertheless, the achieved simulation and optimization results are validated against experimental data. The proposed optimization method itself is based on multi-objective evolutionary algorithms (MOEAs) combined with computational fluid dynamics (CFD) for evaluation of the vector-valued objective function.
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Parametrický generátor výpočetní sítě trubkového svazku výměníku tepla pro OpenFOAM
Petrů, Martin ; Juřena, Tomáš (oponent) ; Turek, Vojtěch (vedoucí práce)
Tato diplomová práce pojednává o základech výpočetní dynamiky tekutin (CFD), důvodech jeho použití a související nutnosti vytvářet výpočetní sítě. Další část práce se zaměřuje na vyhodnocování kvality výpočetních sítí a stručně na výpočetní metody CFD. Jsou také srovnány dostupné síťové generátory a poskytnut přehled o možnostech tvorby sítí. Dále jsou uvedeny základní informace o softwaru OpenFOAM a jeho možnostech, zejména tvorby sítě pomocí aplikace blockMesh. Následující část práce je věnována popisu vyvinuté aplikace a jejím funkcím pro generování kvalitní výpočetní sítě trubkového svazku výměníku tepla pro software OpenFOAM. V závěru je simulací ustáleného proudění ověřena správnost vytvořené sítě a její dostatečná kvalita.
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Development of CFD solver for four-way coupled particle-laden flows
Šourek, M. ; Isoz, Martin
Computational uid dynamics (CFD) simulations containing freely moving bodies are still a challenging topic. More so, if the bodies are large enough to a_ect the uid ow and distributed\ndensely enough to come in contact both with the boundaries of the computational domain and with each other. In this work, we concentrate on the topic of simulation of (i) irregular bodies\nwith ow-induced movement and contact with computational domain boundaries taken into account, and (ii) bodies entrained by the uid and coming in contact not only with the domain\nboundaries but also with each other. The developed modeling approach is based on the hybrid _ctitious domain-immersed boundary method extended by the discrete element method. The\npresent contribution is focused on presentation of simulation principles and results of initial benchmark cases.
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POD-DEIM-based model order reduction for four-way coupled fluid-solid flows
Isoz, Martin ; Šourek, M.
Proper orthogonal decomposition (POD) and discrete empirical interpolation method (DEIM) have become established tools for model order reduction in simulations of fluid flows. However, including moving solid bodies in the computational domain poses additional issues with respect to the fluid-solid coupling and to the solution of the movement of the solids. Still, it seems that if the hybrid ctitious domain-immersed boundary method is used to include the solids in the flow domain, POD-DEIM based approaches may be extended for four-way coupled particleladen flows. The present work focuses on the construction of POD-DEIM based reduced order models for the aforementioned flows.
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Geometrically realistic macro-scale model for multi-scalesimulations of catalytic filters for automotive gasaftertreatment
Hlavatý, Tomáš ; Isoz, Martin ; Plachá, M. ; Šourek, M. ; Kočí, P.
This paper is part of a research focused on simulating (i) the catalytic conversion of environment endangering gases, and (ii) trapping of the particulate matter in automotive exhaust gas aftertreatment. Historically, the catalytic conversion and the filtration of soot particles were performed in independent devices. However, recent trend is to combine the catalytic converter and soot filter into a single device, the catalytic filter. Compared to the standard two-device system, the catalytic filter is more compact and has lower heat losses. Nevertheless, it is highly sensitive to the catalyst distribution. This study extends our recently developed methodology for pore-scale simulations of flow, diffusion and reaction in the coated catalytic filters. The extension consists of enabling data transfer from macro- to pore-scale models by preparing geometrically realistic macro-scale CFD simulations. The simulation geometry is based on XRT scans of real-life catalytic filters. The flow data from the newly developed macro-scale model are mapped as boundary conditions into the pore-scale simulations and used to improve the estimates of the catalytic filter filtration efficiency.
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Předběžná aerodynamická analýza konceptu dálkově řízeného modelu s proudovým pohonem
Novák, Ondřej ; Zikmund, Pavel (oponent) ; Popela, Robert (vedoucí práce)
Tato práce se zabývá aerodynamickou analýzou bezpilotního letounu a následnými úpravami křídla, jeho polohy a přechodu křídlo-trup. Důraz je kladen na charakter odtržení proudění, jeho interakci s dalšími strukturami proudění a jeho vliv na aerodynamické vlastnosti letounu. Cílem úprav je zajištění dostatečné stability a řiditelnosti letounu při nízkých i vysokých úhlech náběhu. V práci byly využity panelové metody a CFD. V případě nepřesností CFD výpočtu byly také připraveny dvě záložní varianty úprav křídla.
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Optimalizace zadního křídla závodního vozu
Feldová, Petra ; Rudolf, Pavel (oponent) ; Štefan, David (vedoucí práce)
Tato diplomová práce se zaměřuje na optimalizaci zadního přítlačného křídla sportovního vozu s využitím open-source softwarů. Práce je věnována optimalizaci 2D profilu zadního křídla vozu. Jako prostředí pro optimalizaci byl zvolen programovací jazyk Python a jako optimalizační funkce algoritmus diferenciální evoluce. Tento algoritmus je dále propojen se softwarem Xfoil, který počítá aerodynamické charakteristiky. Jako parametr posuzující aerodynamickou účinnost byl zvolen poměr vztlakového a odporového koeficientu (C_L/C_D). Druhá část práce se zabývá CFD výpočtem proudění kolem celého vozu a je provedena v open-source softwaru OpenFOAM. Optimalizací profilu křídla bylo dosaženo přibližně 7.9 % zlepšení parametru C_L/C_D, při zachování stability křídla. Přínosem této práce je možnost využití open-source softwarů pro optimalizaci i CFD analýzu, což může do budoucna ušetřit firmám náklady spojené s nákupem licencí komerčních softwarů.
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Model order reduction technique for large scale flow computations
Isoz, Martin
Current progress in numerical methods and available computational power combined with industrial needs promote the development of more and more complex models. However, such models are, due to their complexity, expensive from the point of view of the data storage and the time necessary for their evaluation. The model order reduction (MOR) seeks to reduce the computational complexity of large scale models. We present an application of MOR to the problems originating in the finite volume (FV) discretization of incompressible Navier-Stokes equations. Our approach to MOR is based on the proper orthogonal decomposition (POD)\nwith Galerkin projection. Moreover, the problems arising from the nonlinearities present in the original model are adressed within the framework of the discrete empirical interpolation method (DEIM). We provide a link between the POD-DEIM based MOR and OpenFOAM, which is an open-source CFD toolbox capable of solving even industrial scale problems. The availability of a link between OpenFOAM and POD-DEIM based MOR enables a direct order reduction for large scale systems originating in the industrial practice.
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Numerical simulation of flow in superpak family packings
Smutek, J. ; Isoz, Martin
The distillation is currently the most energy-intensive technology of the chemical industry. Commonly, the distillation is performed in the columns lled with a structured packing. Structured packings are complex structures used to increase the size of the interface available for the mass transfer. Because of the high complexity of both the packings and the physical phenomena occurring during the distillation, the design of the distillation columns is still based mostly on empirical data. In this work, we concentrate on modeling the gas ow in the SuperPak family of structured packings. First, we propose an algorithm for automatic generation\nof the packing geometry. Next, we construct and validate a three-dimensional computational uid dynamics (CFD) model of gas ow through SuperPak 250.Y and SuperPak 350.Y packings. The model validation is done by comparing experimental data of dry pressure losses to the values computed by our model. The obtained di erence between the CFD estimates and experiments is bellow 10 %. Finally, we present a parametric study of the SuperPak 250.Y packing geometry. The devised modeling approach may be easily automated and used for optimization of the SuperPak type packing geometry with respect to the gas ow. Furthermore,\nthe proposed CFD model may be extended to account for the multiphase ow.
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