Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 471 for “"Boltzmann"”.
-
Mesoscopic lattice Boltzmann nemato-dynamics.
… thesis we have developed an anisotropic lattice Boltzmann (LB) model that recovers the incompressible isentropic Ericksen-Leslie-Parodi (ELP) equations of continuum nemato-dynamics in two dimensions with the director confined to the plane. Suitable validations of the developed model against known …
-
OPTICAL COMPUTING IN BOLTZMANN MACHINES
… processing techniques ot the operation of a Boltzmann machine. A Boltzmann machine is a processor that solves a problem by iteratively optimizing an estimate of the solution. The optimization is done by finding a minimum of an energy surface over the solution space. The energy function is …
-
Lattice Boltzmann simulations of multiphase flows
… of my experiences implementing the Lattice Boltzmann Method (LBM) for the purpose of simulating multiphase flows relevant to Air Conditioning and Refrigeration Center (ACRC) applications. Other methodologies have been used to simulate multiphase flow including finite volume based …
-
Reduced basis method for Boltzmann equation
… solve the BGK model of the Knudsen parameterized Boltzmann equation which is 1-d with respect to both space and velocity. In order to solve the Boltzmann equation, we first transform the original differential equation by replacing the dependent variable with another variable, weighted with …
-
Analysis of the generalized Boltzmann equation.
Thesis: M.S., Massachusetts Institute of Technology, Department of Nuclear Engineering, 1972
-
BOLTZMANN ENTROPY FOR UNDERSEA TERRAIN AIDED NAVIGATION
The ability to navigate accurately without Global Positioning Systems (GPS) or beacon systems remains an elusive yet important capability for unmanned systems. Reliance on external beacon systems, like GPS and long baseline, create system vulnerabilities if those beacon systems are damaged or …
-
Some Problems Connected with the Boltzmann Equation
<p>Consider a dilute gas composed of a very large number of molecules moving in space according to the laws of classical mechanics, and colliding in pairs from time to time. Assume that we can disregard all external effects, such as gravity, so that the motion is completely specified by giving the …
-
Boundless Fluids Using the Lattice-Boltzmann Method
… like smoke, fire, and water. The Lattice-Boltzmann Method (LBM) is one fluid simulation technique that has gained recent popularity due to its relatively simple basic algorithm and the ease with which it can be distributed across multiple processors. Unfortunately, current LBM simulations …
-
Multilevel Methods for the Poisson-Boltzmann Equation
We consider the numerical solution of the Poisson-Boltzmann equation (PBE), a three-dimensional second order nonlinear elliptic partial differential equation arising in biophysics. This problem has several interesting features impacting numerical algorithms, including discontinuous coefficients …
-
Advancing Normalising Flows to Model Boltzmann Distributions
… a stochastic manner according to the so-called Boltzmann distribution. Modelling and sampling from it is important for many applications, such as understanding biochemical processes and diseases, as well as discovering drugs. Traditional methods to sample from Boltzmann distributions are …
-
Lattice Boltzmann liquid simulations on graphics hardware
… the field of fluid simulation, the Lattice Boltzmann Method (LBM) stands out as a candidate for GPU execution because its grid-based structure is a natural fit for GPU parallelism. This thesis describes the design and implementation of a GPU-based free-surface LBM fluid simulation. Broadly, …
-
Lattice Boltzmann Methods for Diffuse and Mobile Interfaces
In this work, various systematic approaches are employed for deriving the truncation error of LB models which approximate Navier-Stokes flows. Improved LB models are formulated and validated through point-by-point comparison with limiting benchmark flows. Finally, the modified LB models are used to …
-
QCD Boltzmann equation: beyond the soft-scattering approximation
… equilibrium. To that end, we investigate the QCD Boltzmann equation making use of a calculation scheme that reproduces the known result for scalar interactions and generalizes to a QCD interaction, under an approximation of soft scattering.
-
Efficient particle methods for solving the Boltzmann equation
A new particle simulation method for solving the Boltzmann equation is presented and tested. This method holds a significant computational efficiency advantage for low-signal flows compared to traditional particle methods such as the Direct Simulation Monte Carlo (DSMC). More specifically, the …
-
Meshless Discrete Velocity Boltzmann Model for Porous Media Flow
… fluid dynamics: the discrete velocity Boltzmann equation (DVBE) and the localized collocation meshless model with upwinding (U-LCMM). The DVBE is a high-level model that describes the foundations of transport phenomena by addressing the microscale motions of particles themselves and the …
-
Applications of a novel many-component Lattice Boltzmann simulation
… work has been undertaken to extend the lattice Boltzmann method (LBM), and enable it to represent a large number of mutually immiscible, deformable, droplets (separated by narrow interfaces). The new method imposes a relatively small computational overhead and has been validated against …
-
Anwendung des Lattice-Boltzmann-Verfahrens zur Berechnung strömungsakustischer Probleme
The Lattice-Boltzmann-model is analyzed with regard to application to numerical solution of flow acoustic problems. In the first part of this study the description of sound wave propagation by common variants of the Lattice-Boltzmann-model is examined by calculation of phase velocity and effective …
-
A Numerical Solution of Low-Energy Neutron Boltzmann Equation
<p>A multigroup method using a straight ahead approximation is created to calculate low energy neutron fluence due to the elastic scattering of evaporation neutrons produced in interactions of high energy particles with target nuclei. This multigroup method is added to NASA Langley Research …
Page 1 of 24