GABRIEL ANGELO
8 resultados
Resultados de Busca
Agora exibindo 1 - 8 de 8
Artigo IPEN-doc 28529 RANS-based CFD calculation for pressure drop and mass flow rate distribution in an MTR fuel assembly2021 - SCURO, N.L.; ANGELO, G.; ANGELO, E.; UMBEHAUN, P.E.; TORRES, W.M.; SANTOS, P.H.G.; FREIRE, L.O.; ANDRADE, D.A.This work presents a Reynolds-averaged Navier Stokes–based computational fluid dynamics methodology for the calculation of pressure drop and mass flow rate distribution in a material test reactor flat-plate-type standard fuel assembly (SFA) of the IEA-R1 Brazilian research reactor to predict future improvements in newer SFA designs. The results improve the understanding of the origin of fuel plate oxidation due to high temperatures, and consequently, due to the internal flow dynamics. All numerical analyses were performed with the ANSYS-CFX® commercial code. The observed results show that the movement pin decreases the central channel mass flow due to the length of the vortex at the inlet region. However, the outlet nozzle showed greater general influence in the flow dynamics. It should have a more gradual cross-section transition being away from the fuel plates or a squarer-shaped design to get a more homogeneous mass flow distribution. Optimizing both regions could lead to a better cooling condition. The validation of the IEA-R1 numerical methodology was made by comparing the McMaster University’s dummy model experiment with a numerical model that uses the same numerical methodology. The experimental data were obtained with laser Doppler velocimetry, and the comparison showed good agreement for both pressure drop and mass flow rate distribution using the Standard k-ω turbulence model.Artigo IPEN-doc 26394 A CFD analysis of blockage length on a partially blocked fuel rod2019 - SCURO, N.L.; UMBEHAUN, P.E.; ANGELO, E.; ANGELO, G.; ANDRADE, D.A.After a loss of coolant accident (LOCA), fuel rods may balloon. The swelling can partially block the flow channel, affecting the coolability during reflood phase. In order to analyze the influence of blockage length, using a radial block-age of 90%, varying just the blockage length, many steady state numerical simulations has been done using Ansys-CFX code to verify thermal-hydraulic properties according to different forced cooled conditions. Temperature peaks are observed on cladding, followed by a temperature drop. A 5x5 fuel assembly, with 9 centered ballooned fuel rod, flow redistribution inside channels can also be captured, indicating an overheating zone. Therefore, this study conclude, for the same boundary conditions, the longer the blockage length originated after LOCA events, the higher are the clad temperatures, indicating the possibility of overheat during transient conditions on reflood.Artigo IPEN-doc 24790 A CFD analysis of the flow dynamics of a directly-operated safety relief valve2018 - SCURO, N.L.; ANGELO, E.; ANGELO, G.; ANDRADE, D.A.A three-dimensional numerical study on steady state was designed for a safety relief valve using several openings and inlet pressures. The ANSYS-CFX (R) commercial code was used as a CFD tool to obtain several properties using dry saturated steam revised by IAPWS-IF97. Mass flow and discharge coefficient calculated from simulations are compared to the ASME 2011a Section 1 standard. The model presented constant behavior for opening lifts smaller than 12mm and is very reasonable when compared to the standard (ASME). In addition, the conventional procedure to design normal disc force assumes that all the fluid mechanical energy was converted into work; however, the CFD simulations showed that average normal disc force is about 19% lower than theoretical ASME force, which could prevent the valve oversizing. A numerical validation was conducted for a transonic air flow through a converging-diverging diffuser geometry to verify the solver's ability to capture the position and intensity of a shockwave: the results showed good agreement with the benchmark experiments.Artigo IPEN-doc 21290 Numerical study of the influence of elements inside the wheelhouse on the passenger vehicle aerodynamic2015 - ANGELO, EDVALDO; ANGELO, GABRIEL; SANTOS, PEDRO H. di G.; ANDRADE, DELVONEI A. deArtigo IPEN-doc 17556 Comparison between experimental data and numerical modeling for the natural circulation phenomenon2011 - SABUNDJIAN, GAIANE; ANDRADE, DELVONEI A. de; UMBEHAUN, PEDRO E.; TORRES, WALMIR M.; MACEDO, LUIZ A.; CONTI, THADEU N.; MESQUITA, ROBERTO N. de; ANGELO, GABRIELArtigo IPEN-doc 17845 A three-dimensional thermal and fluid dynamics analysis of a gas cooled subcritical fast reactor driven by a D-T fusion neutron source2011 - ANGELO, G.; ANDRADE, D.A.; ANGELO, E.; CARLUCCIO, T.; ROSSI, P.C.R.; TALAMO, A.Artigo IPEN-doc 18039 A mathematical model for metastable condition determination of highly flashing liquid flows through expansion devices2012 - ANGELO, E.; ANGELO, G.; ANDRADE, D.A.Artigo IPEN-doc 18093 A numerical and three-dimensional analysis of steady state rectangular natural circulation loop2012 - ANGELO, G.; ANDRADE, D.A.; ANGELO, E.; TORRES, W.M.; SABUNDJIAN, G.; MACEDO, L.A.; SILVA, A.F.