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Št. zadetkov: 8
Using a dynamic and constant mesh in numerical simulation of the free-rising bubble
Zlatko Rek
Izvirni znanstveni članek
Oznake: dvofazni tok;vzgonsko gibanje mehurčka;računalniška dinamika tekočin;dinamična računska mreža;konstantna računska mreža;two-phase flow;free-rising bubble;CFD;volume of fluid;constant mesh;dynamic mesh;
A two-phase bubbly flow is often found in the process industry. For the efficient operation of such devices, it is important to know the details of the flow. The paper presents a numerical simulation of the rising bubble in a stagnant liquid column. The interFOAM solver from the open source Computat ...
Leto: 2019 Vir: Fakulteta za strojništvo (UL FS)
Tehnika podobmočij metode temeljnih rešitev pri reševanju Laplaceove enačbe
Zlatko Rek, Božidar Šarler
Objavljeni znanstveni prispevek na konferenci
Oznake: metoda temeljnih rešitev;tehnika podobmočij;Laplaceova enačba;
Za reševanje Laplaceove enačbe je bila uporabljena metoda temeljnih rešitev. Metoda je enostavna in zelo natančna. Njena slabost je potreba po umetnem robu, ki predstavlja lokacije izvornih točk. Zaradi tega ta metoda v osnovni obliki ni uporabna v primeru kompleksnega računskega območja. Težavo odp ...
Leto: 2020 Vir: Fakulteta za strojništvo (UL FS)
ǂThe ǂmethod of fundamental solutions for the Stokes flow with the subdomain technique
Zlatko Rek, Božidar Šarler
Izvirni znanstveni članek
Oznake: the method of fundamental solutions;Stokes flow;subdomain technique;interface conditions;
The collocation version of the Method of Fundamental Solutions (MFS) with subdomains is introduced in the present work for the solution of the 2D Stokes flow in backward-facing-step geometry, including Dirichlet and Neumann boundary conditions. The motivation for the present work is the inability of ...
Leto: 2021 Vir: Fakulteta za strojništvo (UL FS)
ǂThe ǂability of a soil temperature gradient-based methodology to detect leaks from pipelines in buried district heating channels
Matjaž Perpar, Zlatko Rek
Izvirni znanstveni članek
Oznake: district heating network;heat losses;numerical experiment;soil temperature gradient;water leak;detection method robustness;
We carried out several numerical experiments to analyze how different boundary conditions affect the ability to detect small pipeline leaks. Our method is based on determining the soil temperature gradient above a buried district heating channel. The equivalent thermal conductivity of a wet insulati ...
Leto: 2021 Vir: Fakulteta za strojništvo (UL FS)
Hitrostno-tlačna formulacija metode temeljnih rešitev za Stokesov tok
Zlatko Rek, Božidar Šarler
Objavljeni znanstveni prispevek na konferenci
Oznake: metoda temeljnih rešitev;Stokesov tok;hitrostno-tlačna formacija;
Za reševanje enačb Stokesovega toka je bila izpeljana hitrostno-tlačna formulacija metode temeljnih rešitev. Metoda je enostavna in zelo natančna. Uspešnost tega pristopa je prikazana na primeru 2D Poiseuillovega toka in primeru toka v 2D kanalu s T-razcepom. Primerjava rezultatov izračuna s predsta ...
Leto: 2021 Vir: Fakulteta za strojništvo (UL FS)
Formulation of the method of fundamental solutions for two-phase Stokes flow
Zlatko Rek, Božidar Šarler
Izvirni znanstveni članek
Oznake: Stokes equations;two-phase flow;free boundary problems;method of fundamental solutions;subdomain technique;
The method of fundamental solutions with a subdomain technique is used for the solution of the free boundary problem associated with a two-phase Stokes flow in a 2D geometry. The solution procedure is based on the collocation of the boundary conditions with the Stokeslets. It is formulated for the f ...
Leto: 2024 Vir: Inštitut za kovinske materiale in tehnologije (IMT)
Modified method of regularized sources for potential flow
Zlatko Rek, Rizwan Zahoor, Božidar Šarler
Izvirni znanstveni članek
Oznake: method of fundamental solutions;method of regularized sources;potential flow;neumann boundary conditions;
This paper describes the development of the Method of Regularized Sources for potential flow problems. It is based on the modification of the fundamental solution near the source point by replacing the singularity with a blob in form of a steep rational function. This allows to solve the problems in ...
Leto: 2021 Vir: Fakulteta za strojništvo (UL FS)
Numerical simulation of heat load for multilayer laue lens under exposure to XFEL pulse trains
Zlatko Rek, Henry N. Chapman, Božidar Šarler, Saša Bajt
Izvirni znanstveni članek
Oznake: rentgenski laserji;rentgenska optika;večplastne leče Laue;prenos toplote;numerične simulacije;X-ray free-electron lasers;X-ray optics;multilayer Laue lens;heat transfer;numerical simulation;
Multilayer Laue lenses (MLLs) made from WC and SiC were previously used to focus megahertz X-ray pulse trains of the European XFEL free-electron laser, but suffered damage with trains of 30 pulses or longer at an incident fluence of about 0.13 J/cm[sup]2 per pulse. Here, we present numerical simulat ...
Leto: 2022 Vir: Fakulteta za strojništvo (UL FS)
Št. zadetkov: 8
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