A Numerical Model for Heat and Moisture Transfer in Porous Media of Building Envelopes

Scussiato, Talita; Ito, William Hideki; Ramis, Jacqueline Elhage; Queiroz, Paulo Ivo Braga de

doi:10.48084/etasr.5120

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…In this section we will use finite difference method [3,27] For the solution of (07)-(09) the Crank Nicolson explicit Finite difference method is applied due its advantage of being unconditionally stable. For the discretization of these equations the central difference scheme for the space variables x and y are used but discretization of time derivative function forward difference scheme are used that are defined as Forward difference in time.…”

Section: Numerical Solutionmentioning

confidence: 99%

Numerical Simulation of 2D Shallow water equation with constant external body force by using Finite difference method

Rajput,

Kamboh,

Amur

et al. 2023

VFAST trans. math.

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In this paper the numerical modeling and simulation of 2D shallow water equations is discussed with the non-flat topography. The sets of these equations is solved by means of the Crank-Nicolson finite difference method with constant external body force and Darcy Weisbach equation is used for friction slope parameter. We have obtained the important results that, as soon as we start the time then Height evaluation function has the maximum amplitude wave length which is decreasing when the time increases. The numerical solution algorithm works well and enables to predict the water elevation and velocity at any instance and any location in the domain.

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Section: Numerical Solutionmentioning

confidence: 99%

Numerical Simulation of 2D Shallow water equation with constant external body force by using Finite difference method

Rajput,

Kamboh,

Amur

et al. 2023

VFAST trans. math.

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show abstract

“…U-value also regulates the energy consumption and thermal comfort inside the building. The conductive heat flow was reduced due to the evaporation process with natural stones as a building material, which increased the thermal comfort inside with a reduction in energy consumption [7]. Natural convection heat transfer rates increase in an open enclosure with an air cavity with an aspect ratio of 2 [8].…”

Section: Introductionmentioning

confidence: 99%

Statistical Analysis of the Factors influencing the In Situ U-Value of Walls

Rashmi,

Kumar

2024

Eng. Technol. Appl. Sci. Res.

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Building thermal performance testing requires in situ measurement techniques that are well supported and validated by simulation with statistics to improve the accuracy of the results. Local on-site performance of building components is different from the theoretical one, influenced by factors affecting the building's thermal conditions. The current paper reviews the factors influencing the measured U-value results in the heat flux method based on quantitative findings of other studies through regression and correlation statistics. The findings regarding the current status of knowledge are limited to in situ methods without detailed insights of response time, sensitivity analysis, and thermal boundary conditions in the local context. Regression analysis between wall characteristics, time duration, temperature difference, and the measured U-value shows a very strong and statistically significant impact of these variables on the accuracy of the measured U-value of low transmittance walls. The R2 value indicates that three variables can collectively explain 91% of the variance in the measured U-value. There is a linear correlation between the wall characteristics and the measured U-value and a non-linear correlation between the time duration, temperature difference, and the measured U-value. Future work will focus on developing a measurement framework that considers time-dependent variables, dynamic weather, and uncertainty with high accuracy for different boundary conditions.

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Mathematical and Numerical Explanation of the Nonlinear Acoustic Wave Interaction in Acousto-Optical Cells

Ourahmoun,

Guessoum

2024

Eng. Technol. Appl. Sci. Res.

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In addition to a recently acousto-optical deflector that has been the subject of both theoretical and experimental analysis, this work presents the successful processing of two acousto-optical deflectors that have been orthogonally positioned using two frequency-modulated ultrasonic waves. A comprehensive theoretical analysis is conducted, based on the Collins integral and the ABCD matrix formalism, to explain how the positions of the diffracted orders oscillate in two dimensions as a function of time. The numerical simulation of the derived formula demonstrates the potential for steering a laser beam along Lissajous trajectories. The trajectories in question are observed to exhibit a variety of shapes and velocities. They are sometimes linear with sinusoidal velocities, sometimes circular with constant velocities, and often elliptical with variable velocities. The noteworthy aspect is that all these diffracted orders traverse the spatial domain with an identical sweep frequency, despite the heterogeneity of their trajectories and velocities. Furthermore, these trajectories can be shaped by controlling the phase shift value. This technique can be employed in metrology for rotation measurements based on the Doppler effect. Additionally, it can be used to develop a spatial display that enables tracing Lissajous trajectories, rather than relying on an oscilloscope.

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A Numerical Model for Heat and Moisture Transfer in Porous Media of Building Envelopes

Cited by 3 publications

References 19 publications

Numerical Simulation of 2D Shallow water equation with constant external body force by using Finite difference method

Numerical Simulation of 2D Shallow water equation with constant external body force by using Finite difference method

Statistical Analysis of the Factors influencing the In Situ U-Value of Walls

Mathematical and Numerical Explanation of the Nonlinear Acoustic Wave Interaction in Acousto-Optical Cells

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