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Showing 1 to 13 of 13 for “"discrete ordinates"”.
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Discrete ordinates CT organ dose simulator (DOCTORS)
… CT voxel phantom. This work proposes a new code, Discrete Ordinate CT Organ Dose Simulator (DOCTORS) which utilizes a GPU accelerated raytracer and discrete ordinate solver to compute photon flux in the patient. The flux is then converted to dose.</p><p>The DOCTORS code was benchmarked against …
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Development of the Adaptive Collision Source Method for Discrete Ordinates Radiation Transport
… implemented in the 3-D, parallel, multigroup discrete ordinates code TITAN. This code was tested on a variety of test problems including fixed-source and eigenvalue problems. The ACS implementation in TITAN has shown a reduction in computation time by a factor of 1.5-4 on the fixed-source test …
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The development and evaluation of 252Cf neutron irradiation facilities for two biomedical applications using discrete ordinates, Monte Carlo, and experimental methods.
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Nuclear Engineering, 1977
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Implementation and Verification of the Subgroup Decomposition Method in the TITAN 3-D Deterministic Radiation Transport Code
… of the SDM into the three-dimensional, discrete ordinates (SN) deterministic transport code TITAN. The new version of TITAN, TITAN-SDM, is tested using 1-D and 2-D benchmark problems based on the Japanese designed High Temperature Engineering Test Reactor (HTTR). In addition to accuracy, …
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Large eddy simulation of a fuel-rich turbulent non-premixed reacting flow with radiative heat transfer
… heat transfer during combustion process applying Discrete Ordinates Method (DOM). LES seeks the solution by separating the flow field into large-scale eddies, which carry the majority of the energy and are resolved directly, and small-scale eddies, which have been modelled via Smagorinsky model …
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Coupled radiation transport and mobile depletion for health physics and environmental impact applications
… some of these challenges. This work developed a discrete ordinates radiation transport solver and a radionuclide trace species transport solver in the MOOSE framework for Caribou. This radiation transport solver is compared to several benchmark problems to determine its accuracy with and without …
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Exploring Alternative Designs for Solar Chimneys using Computational Fluid Dynamics
… in the system, it is necessary to employ the Discrete Ordinates radiation model. Different chimney configurations were studied with the hopes of designing a shorter solar chimney without decreases the amount of airflow through the system. Clusters of four and five shorter chimneys decreased …
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Combustion simulations in Diesel engines using reduced reaction mechanisms
… by a grey model. The RTE was solved using the discrete ordinates method (DOM), which involves solving the RTE in discrete directions. The ignition and chemistry models were implemented in a standard CFD code, KIVA and used to simulate the combustion in a Caterpillar engine, for which …
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A Compiler Directed Framework for Parallel Compositional Systems
… been validated over Sweep3D, a benchmark for 3D discrete ordinates neutron transport [Koch et al., 1992], and our Open Network Emulator project. Performance results show that the context switch overhead in the Weaves framework is almost identical to threads.
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Numerical study of nanofluid-based direct absorber solar collector systems with metallic/carbon nanoparticles, multiple geometries and multi-mode heat transfer
… model, P1 Traugott model, Chandrasekhar discrete ordinates model (DOM). ANSYS FLUENT and MAPLE symbolic software are used as the numerical tools to solve the relevant boundary value problems. Generally, the Tiwari-Das nanoscale model is used although the Buongiorno two-component nanofluid …
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Análisis del comportamiento térmico y fluido-dinámico de las fachadas ventiladas de junta abierta
… k-¿ RNG y del modelo de radiación DO (Discrete Ordinates) como los que mejores resultados obtienen. Por último, el modelo numérico desarrollado y validado anteriormente, se ha utilizado para simular una fachada ventilada de junta abierta basada en dimensiones reales, y los resultados se …
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A lattice boltzmann/s n framework for coupled heat transfer and neutron transport problems
… neutron transport equation is solved using the discrete ordinates method (SN ); and the heat conduction equation is solved using the lattice Boltzmann method (LBM). In the SN method, the angle in the integro-differential form of the NTE is discretized. Similarly, the continuous velocity space is …
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Voxel-Level Absorbed Dose Calculations With A Deterministic Grid-Based Boltzmann Solver For Nuclear Medicine and The Clinical Value of Voxel-Level Calculations
<p>Voxel-level absorbed dose (VLAD) is rarely calculated for nuclear medicine (NM) procedures involving unsealed sources or 90Y microspheres (YM). The current standard of practice for absorbed dose calculations in NM utilizes MIRD S-values, which 1) assume a uniform distribution in organs, 2) do …