Numerical Modeling of the Near-Subsurface Temperature Distributions in the Presence of Time Varying Air Temperature in the Boundary Condition and Space Varying Temperature for the Initial Condition - new
M. Ravi, D. V. Ramana, R. N. Singh
CSIR - National Geophysical Research Institute, Hyderabad, Telangana, India
The subsurface thermal structure in presence of groundwater recharge/discharge has been obtained by applying the Robin type boundary condition at the earth’s surface. The Robin type boundary condition involves the effect air temperatures at the surface which are taken as exponentially varying with time and the initial condition which is taken as exponential function of depth. The numerical ...
J. M. Dedulle , K. Ariyawong , D. Chaussende 
 Univ. Grenoble Alpes, Grenoble, France
 CNRS, Grenoble, France
Silicon carbide (SiC) single crystals are industrially produced by the physical vapor transport technique. Apart from the geometry of the growth setup, there are two main process parameters that can be controlled: temperature and pressure. To support the development of the process, numerical simulation has imposed as the only tool able to describe the process itself, providing a good evaluation ...
Sensibility Analysis of Inductance Involving an E-core Magnetic Circuit for Non Homogeneous Material
K. Z. Gomes , T. A. G. Tolosa , E. V. S. Pouzada ,
 Mauá Institute of Technology, São Caetano do Sul, SP, Brazil
In this work, a methodology is developed, based on the application of finite element method in the frequency domain, using the COMSOL Multiphyics software, aiming the sensibility analysis of inductance calculation involving some configurations of an E-core magnetic circuit. Such important analysis, are made from several geometries and considering different frequencies for the source current ...
Heat Transfer Simulation for Reliability Estimation of Additive Manufacturing Process using the COMSOL Multiphysics® Software
K. W. K. Leung , A. Keshtgar , N. Iyyer ,
 Technical Data Analysis, Inc., Falls Church, VA, USA
Selective laser melting (SLM) is a popular additive manufacturing (AM) process that creates 3D metal parts by fusing fine metallic powder together. However, it remains difficult to certify AM part as its final quality can largely vary, depending on material and process variations. These variations govern its final density, residual stress distribution and microstructure, resulting in uncertainty ...
Simulation and Validation of Seasonal Soil Temperature Variations Using COMSOL Multiphysics® Software
L. J. Matel ,
 Green Streets Infrastructure LLC, Seattle, WA, USA
The influence of the energy (heat) stored in the earth as a major factor in environmental soil processes is recognized by the soil science community. The heat (energy) supplied by the earth is known to fluctuate with depth below ground surface and time of year, obviously as a function of solar radiation variations through the seasons. The variation of energy available to drive evaporation can ...
L. J. Matel 
 Green Streets Infrastructure LLC, Seattle, WA, USA
The four foot diameter class A evaporation pan is used by the scientific community as the standard for determining evaporation rates for a number of purposes. The COMSOL Multiphysics® software provides the necessary tools to adequately develop synthetic estimates of evaporation values for input into hydrologic simulation models and other earth science applications. This paper presents ...
C. Soussi , O. Fouché , G. Bracq , S. Minec ,
 Le Cnam, Paris, France
 Ecole des Ponts, Champs-sur-Marne, France
 Bouygues Construction, Saint-Quentin-en-Yvelines, France
This work investigates the possibility of thermal activation of future tunnels to heat and/or cool the surface buildings or infrastructure such as subways stations. The principle is to insert pipes in the tunnel lining segments, which are connected to a geothermal pump. A heat transfer fluid antifreeze circulates inside the tubes to exchange heat with the surrounding environment (tunnel air and ...
F.X. Borràs, J. Ukonsaari, A. Almqvist
Luleå University of Technology, Luleå, Sweden
Vattenfall Research and Development, Luleå, Sweden
Spring-supported thrust bearings are used in huge rotor dynamic machines, generally to support the shafts from the biggest hydropower generators. Any attempt of modifying yhis type of thrust bearing implies huge investment and is associated with some risks. The goal of the present work is to predict the performance of spring-supported thrust bearings. With the model it is possible to carry out ...
Use of Simulation in the Development of Next-generation Measurement Standards for Radiation Dosimetry
R. E. Tosh, H. Chen-Mayer
NIST, Gaithersburg, MD, USA
Calibration of field instruments used in radiation treatment clinics is currently traceable to NIST primary standards via protocols involving static, flat-field radiation beams. By contrast, radiation beams prescribed for treating cancer incorporate temporal and spatial modulation strategies in order to maximize dose to the tumor while sparing healthy tissue. Differences in the detector ...
O. Kraft , J. Gaiser , M. Stripf ,
 University of Applied Sciences, Karlsruhe, Baden-Würtemberg, Germany
Standard measuring techniques for thermal conductivity cannot be readily applied to determine the load-dependent thermal conductivity of porous adsorbents, because the local ad- and desorption inside the specimen and the thickness of the specimen are not considered. Hence, in this work a new measuring procedure combining the transient hot bridge (THB) with a three dimensional finite element ...