Global ETD Search
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Showing 1 to 7 of 7 for “"Differential Filter"”.
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Approximate Deconvolution Reduced Order Modeling
… (POD) is used to define the ROM basis and a POD differential filter is used to define the large ROM structures. An approximate deconvolution (AD) approach is used to solve the ROM closure problem and develop a new AD-ROM. This AD-ROM is tested in the numerical simulation of the one-dimensional …
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Stabilization of POD-ROMs
… the Leray ROM (L-ROM) and the evolve-then-filter ROM (EF-ROM). Both Reg-ROMs use explicit POD spatial filtering to regularize (smooth) some of the terms in the standard G-ROM. I propose two different POD spatial filters: one based on the POD projection and a novel POD differential filter. …
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Study of two-way coupled particle laden turbulent flow over a backward-facing step using large-eddy simulation
… stress tensor, and the random walk (RW) and the differential filter (DF) based models for the subgrid dispersion. The assessment of subgrid models is carried out by comparison of simulation results against the available experimental data. Based on the assessment studies, the WALE model for the …
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Commutation Error in Reduced Order Modeling
We investigate the effect of spatial filtering on the recently proposed data-driven correction reduced order model (DDC-ROM). We compare two filters: the ROM projection, which was originally used to develop the DDC-ROM, and the ROM differential filter, which uses a Helmholtz operator to attenuate …
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Analysis and Design of a DCM SEPIC PFC with Adjustable Output Voltage
… induction cooker is composed by input filter, diode-bridge rectifier, and full bridge or half bridge series resonant circuit (SRC). High frequency magnetic field is induced through the switching action to heat the pan. The power level is usually controlled through pulse frequency …
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Filter Based Stabilization Methods for Reduced Order Models of Convection-Dominated Systems
In this thesis, I examine filtering based stabilization methods to design new regularized reduced order models (ROMs) for under-resolved simulations of unsteady, nonlinear, convection-dominated systems. The new ROMs proposed are variable delta filtering applied to the evolve-filter-relax ROM (V-EFR …
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Diferenční a pseudodiferenční filtrační obvody
Bakalářská práce se zabývá analogovými kmitočtovými filtry, pracující v diferenčním a~pseudodiferenčním režimu. Je zaměřena zejména na aktivní filtry druhého řádu, které využívají moderních aktivních prvků. U konkrétních řešení je analyzována možnost řízení parametrů filtru. Dále se text zabývá …