Browsing by Author "Muga, I."
Now showing items 17 of 7

Goaloriented adaptivity using unconventional error representations for the 1D Helmholtz equation
Darrigrand, V.; Pardo, D.; Muga, I. (20151231)In this work, the error of a given output functional is represented using bilinear forms that are different from those given by the adjoint problem. These representations can be employed to design novel h, p, and hp ... 
Goaloriented adaptivity using unconventional error representations for the multidimensional Helmholtz equation
Darrigrand, V.; RodríguezRozas, A.; Muga, I.; Pardo, D.; Romkes, A.; Prudhomme, S. (20170627)In goal‐oriented adaptivity, the error in the quantity of interest is represented using the error functions of the direct and adjoint problems. This error representation is subsequently bounded above by element‐wise error ... 
GoalOriented pAdaptivity using Unconventional Error Representations for a 1D Steady State ConvectionDiffusion Problem
Pardo, D.; Darrigrand, V.; RodríguezRozas, A.; Muga, I. (2017)This work proposes the use of an alternative error representation for GoalOriented Adaptivity (GOA) in context of steady state convection dominated diffusion problems. It introduces an arbitrary operator for the computation ... 
Influence of boreholeeccentred tools on wireline and loggingwhiledrilling sonic logging measurements
Pardo, D.; Matuszyky, P.; TorresVerdín, C.; Mora, A.; Muga, I. (201306)We describe a numerical study to quantify the influence of tooleccentricity on wireline and loggingwhiledrilling (LWD) sonic logging measurements. Simulations are performed with a hpadaptive Fourier FiniteElement ... 
A Numerical 1.5D Method for the Rapid Simulation of Geophysical Resistivity Measurements
Shahriari, M.; Rojas, S.; Pardo, D.; RodríguezRozas, A.; Bakr, S.A.; Calo, V.M.; Muga, I. (20180614)In some geological formations, borehole resistivity measurements can be simulated using a sequence of 1D models. By considering a 1D layered media, we can reduce the dimensionality of the problem from 3D to 1.5D via a ... 
A QuadratureFree Method for Simulation and Inversion of 1.5D Direct Current (DC) Borehole Measurements
Rojas, S.; Muga, I.; Pardo, D. (201612)Resistivity inverse problems are routinely solved in order to characterize hydrocarbon bearing formations. They often require a large number of forward problems simulations. When considering a one dimensional (1D) planarly ... 
Semianalytical response of acoustic logging measurements in frequency domain
Muga, I.; Pardo, D.; Matuszyk, P.J.; TorresVerdin, C. (20151231)This work proposes a semianalytical method for simulation of the acoustic response of multipole eccentered sources in a fluidfilled borehole. Assuming a geometry that is invariant with respect to the azimuthal and vertical ...