52 citations · 465 across the 29 of their papers we have counts for
29 papers
Surface transfer coefficients estimation for heat conduction problem using the Bayesian framework
Julien Berger, Clemence Legros
This work deals with an inverse two-dimensional nonlinear heat conduction problem to determine the top and lateral surface transfer coefficients. For this, the \textsc{B}ayesian fr…
Assessing the wall energy efficiency design under climate change using POD reduced order model
Julien Berger, Cyrille Allery, Anaïs Machard
Within the environmental context, numerical modeling is a promising approach to assessing the energy efficiency of buildings. Resilient buildings need to be designed, and capable o…
Estimation of the thermal properties of an historic building wall by combining Modal Identification Method and Optimal Experiment Design
Julien Berger, Benjamin Kadoch
The estimation of wall thermal properties by \emph{in situ} measurement enables to increase the reliability of the model predictions for building energy efficiency. Nevertheless, r…
Searching an optimal experiment observation sequence to estimate the thermal properties of a multilayer wall under real climate conditions
Ainagul Jumabekova, Julien Berger, Aurélie Foucquier +1
The \emph{in situ} estimation of the thermal properties of existing building wall materials is a computationally expensive procedure. Its cost is highly proportional to the duratio…
An efficient sensitivity analysis for energy performance of a building envelope: a continuous derivative based approach
Ainagul Jumabekova, Julien Berger, Aurélie Foucquier
Within the framework of building energy assessment, this article proposes to use a derivative based sensitivity analysis of heat transfer models in a building envelope. Two, global…
An efficient two-dimensional heat transfer model for building envelopes
Julien Berger, Suelen Gasparin, Walter Mazuroski +1
A two-dimensional model is proposed for energy efficiency assessment through the simulation of heat transfer in building envelopes, considering the influence of the surrounding env…
Parametric PGD model used with orthogonal polynomials to assess efficiently the building's envelope thermal performance
Marie-Hélène Azam, Julien Berger, Sihem Guernouti +2
Estimating the temperature field of a building envelope could be a time-consuming task. The use of a reduced-order method is then proposed: the Proper Generalized Decomposition met…
Dimensionless formulation and similarity to assess the main phenomena of heat and mass transfer in building porous material
Julien Berger, Clemence Legros, Madina Abdykarim
Within the environmental context, several tools based on simulations have been proposed to analyze the physical phenomena of heat and mass transfer in porous materials. However, it…
Average reduced model to simulate solutions for heat and mass transfer through porous material
Julien Berger, Madina Abdykarim
The design of numerical tools to model the behavior of building materials is a challenging task. The crucial point is to save computational cost and maintain high accuracy of predi…
Parameter estimation and model selection for water sorption in a wood fibre material
Julien Berger, Thibaut Colinart, Bruna R. Loiola +1
The sorption curve is an essential feature for the modelling of heat and mass transfer in porous building materials. Several models have been proposed in the literature to represen…
An efficient numerical method for a long-term simulation of heat and mass transfer: the case of an insulated rammed earth wall
Madina Abdykarim, Julien Berger, Denys Dutykh +1
Innovative numerical scheme studied in this work enables to overcome two main limitations of Building Performance Simulation (BPS) programs as high computational cost and the choic…
On the comparison of three numerical methods applied to building simulation: finite-differences, RC circuit approximation and a spectral method
Julien Berger, Suelen Gasparin, Denys Dutykh +1
Predictions of physical phenomena in buildings are carried out by using physical models formulated as a mathematical problem and solved by means of numerical methods, aiming at eva…
Evaluation of the reliability of building energy performance models for parameter estimation
Julien Berger, Denys Dutykh
The fidelity of a model relies both on its accuracy to predict the physical phenomena and its capability to estimate unknown parameters using observations. This article focuses on…
Long wave interaction with a partially immersed body. Part I: Mathematical models
Gayaz Khakimzyanov, Denys Dutykh
In the present article we consider the problem of wave interaction with a partially immersed, but floating body. We assume that the motion of the body is prescribed. The general ma…
A new model for simulating heat, air and moisture transport in porous building materials
Julien Berger, Denys Dutykh, Nathan Mendes +1
This work presents a detailed mathematical model combined with an innovative efficient numerical model to predict heat, air and moisture transfer through porous building materials.…
An efficient numerical model for liquid water uptake in porous material and its parameter estimation
Ainagul Jumabekova, Julien Berger, Denys Dutykh +4
The goal of this study is to propose an efficient numerical model for the predictions of capillary adsorption phenomena in a porous material. The Scharfetter-Gummel numerical schem…
An innovative method to determine optimum insulation thickness based on non-uniform adaptive moving grid
Suelen Gasparin, Julien Berger, Denys Dutykh +1
It is well known that thermal insulation is a leading strategy for reducing energy consumption associated to heating or cooling processes in buildings. Nevertheless, building insul…
An adaptive simulation of nonlinear heat and moisture transfer as a boundary value problem
Suelen Gasparin, Julien Berger, Denys Dutykh +1
This work presents an alternative view on the numerical simulation of diffusion processes applied to the heat and moisture transfer through porous building materials. Traditionally…
On the solution of coupled heat and moisture transport in porous material
Julien Berger, Suelen Gasparin, Denys Dutykh +1
Comparisons of experimental observation of heat and moisture transfer through porous building materials with numerical results have been presented in numerous studies reported in l…
Analysis and improvement of the VTT mold growth model: application to bamboo fiberboard
Julien Berger, Hervé Le Meur, Denys Dutykh +2
The reliability of a model is its accuracy in predicting the physical phenomena using the known input parameters. It also depends on the model's ability to estimate relevant parame…
Advanced reduced-order models for moisture diffusion in porous media
Suelen Gasparin, Julien Berger, Denys Dutykh +1
It is of great concern to produce numerically efficient methods for moisture diffusion through porous media, capable of accurately calculate moisture distribution with a reduced co…
On the estimation of moisture permeability and advection coefficients of a wood fibre material using the optimal experiment design approach
Julien Berger, Thomas Busser, Denys Dutykh +1
This paper presents a practical application of the concept of Optimal Experiment Design (OED) for the determination of properties of porous materials with in-situ measurements and…
Solving nonlinear diffusive problems in buildings by means of a Spectral Reduced-Order Model
Suelen Gasparin, Julien Berger, Denys Dutykh +1
This paper proposes the use of a Spectral method to simulate diffusive moisture transfer through porous materials as a Reduced-Order Model (ROM). The Spectral approach is an a prio…
An efficient method to estimate sorption isotherm curve coefficients
Julien Berger, Thomas Busser, Denys Dutykh +1
This paper deals with an inverse problem applied to the field of building physics to experimentally estimate three sorption isotherm coefficients of a wood fiber material. First, t…