Simon Mendez
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View article: A discrete de Rham discretization of interface diffusion problems with application to the Leaky Dielectric Model
A discrete de Rham discretization of interface diffusion problems with application to the Leaky Dielectric Model Open
International audience
How a table modulates the risk of airborne transmission between facing individuals Open
Airborne transmission has been recognised as an important route of transmission for SARS-CoV-2, the virus responsible for the COVID-19 pandemic. While coughing and sneezing are major aerosol sources, asymptomatic transmission highlights th…
Viral Transmission in Pedestrian Crowds: Coupling an Open-source Code Assessing the Risks of Airborne Contagion with Diverse Pedestrian Dynamics Models Open
We study viral transmission in crowds via the short-ranged airborne pathway using a purely model-based approach. Our goal is two-pronged. Firstly, we illustrate with a concrete and pedagogical case study how to estimate the risks of new vi…
View article: Physics-Guided Neural Networks for Intraventricular Vector Flow Mapping
Physics-Guided Neural Networks for Intraventricular Vector Flow Mapping Open
Intraventricular vector flow mapping (iVFM) seeks to enhance and quantify color Doppler in cardiac imaging. In this study, we propose novel alternatives to the traditional iVFM optimization scheme using physics-informed neural networks (PI…
How a table modulates the risk of airborne transmission between facing individuals Open
Airborne transmission has been recognized as an important route of transmission for SARS-CoV-2, the virus responsible for the COVID-19 pandemic. While coughing and sneezing are spectacular sources of production of infected aerosols with fa…
View article: Physics-Guided Neural Networks for Intraventricular Vector Flow Mapping
Physics-Guided Neural Networks for Intraventricular Vector Flow Mapping Open
Intraventricular vector flow mapping (iVFM) seeks to enhance and quantify color Doppler in cardiac imaging. In this study, we propose novel alternatives to the traditional iVFM optimization scheme by utilizing physics-informed neural netwo…
Viral transmission in pedestrian crowds: Coupling an open-source code assessing the risks of airborne contagion with diverse pedestrian dynamics models Open
We study viral transmission in crowds via the short-ranged airborne pathway using a purely model-based approach. Our goal is two-pronged. Firstly, we illustrate with a concrete and pedagogical case study how to estimate the risks of new vi…
Viral transmission in pedestrian crowds: Coupling an open-source code assessing the risks of airborne contagion with diverse pedestrian dynamics models Open
We study viral transmission in crowds via the short-ranged airborne pathway\nusing a purely model-based approach. Our goal is two-pronged. Firstly, we\nillustrate with a concrete and pedagogical case study how to estimate the risks\nof new…
View article: Critical evaluation of kinetic schemes for coagulation
Critical evaluation of kinetic schemes for coagulation Open
Two well-established numerical representations of the coagulation cascade either initiated by the intrinsic system (Chatterjee et al., PLOS Computational Biology 2010) or the extrinsic system (Butenas et al., Journal of Biological Chemistr…
View article: Assessing a heterogeneous model for accounting for endovascular devices in hemodynamic simulations of cerebral aneurysms
Assessing a heterogeneous model for accounting for endovascular devices in hemodynamic simulations of cerebral aneurysms Open
The heterogeneous model developed by Berod et al [ Int J Numer Method Biomed Eng 38, 2021] for representing the hemodynamic effects of endovascular prostheses is applied to a series of 10 patient specific cerebral aneurysms, 6 being treate…
From Microscopic Droplets to Macroscopic Crowds: Crossing the Scales in Models of Short‐Range Respiratory Disease Transmission, with Application to COVID‐19 Open
Short‐range exposure to airborne virus‐laden respiratory droplets is an effective transmission route of respiratory diseases, as exemplified by Coronavirus Disease 2019 (COVID‐19). In order to assess the risks associated with this pathway …
View article: Red blood cell rheology during a complete blood count: A proof of concept
Red blood cell rheology during a complete blood count: A proof of concept Open
Counting and sizing blood cells in hematological analyzers is achieved using the Coulter principle. The cells flow in a micro-aperture in which a strong electrical field is imposed, so that an electrical perturbation, called pulse, is meas…
View article: Accelerated sequences of 4D flow MRI using GRAPPA and compressed sensing: A comparison against conventional MRI and computational fluid dynamics
Accelerated sequences of 4D flow MRI using GRAPPA and compressed sensing: A comparison against conventional MRI and computational fluid dynamics Open
Purpose To evaluate hemodynamic markers obtained by accelerated GRAPPA ( R = 2, 3, 4) and compressed sensing ( R = 7.6) 4D flow MRI sequences under complex flow conditions. Methods The accelerated 4D flow MRI scans were performed on a puls…
View article: A Pipeline for the Generation of Synthetic Cardiac Color Doppler
A Pipeline for the Generation of Synthetic Cardiac Color Doppler Open
Color Doppler imaging (CDI) is the modality of choice for simultaneous visualization of myocardium and intracavitary flow over a wide scan area. This visualization modality is subject to several sources of error, the main ones being aliasi…
Simulations par dynamique des fluides de la propagation de gouttelettes respiratoires porteuses de charge virale : Gare aux vents et aux courants d'air ! Open
The COVID-19 pandemic has prompted numerous fluid dynamical simulations of the propagation of potentially virus-laden respiratory droplets. While these studies have highlighted the apparent sensitivity of the numerical results to the sizes…
View article: Physics-constrained intraventricular vector flow mapping by color Doppler
Physics-constrained intraventricular vector flow mapping by color Doppler Open
Color Doppler by transthoracic echocardiography creates two-dimensional fan-shaped maps of blood velocities in the cardiac cavities. It is a one-component velocimetric technique since it only returns the velocity components parallel to the…
View article: A heterogeneous model of endovascular devices for the treatment of intracranial aneurysms
A heterogeneous model of endovascular devices for the treatment of intracranial aneurysms Open
Numerical computations of hemodynamics inside intracranial aneurysms treated by endovascular braided devices such as flow‐diverters contribute to understanding and improving such treatment procedures. Nevertheless, these simulations yield …
Colliding respiratory jets as a mechanism of air exchange and pathogen transport during conversations Open
Air exchange between people has emerged in the COVID-19 pandemic as the important vector for transmission of the SARS-CoV-2 virus. We study the airflow and exchange between two unmasked individuals conversing face-to-face at short range, w…
View article: Detecting cells rotations for increasing the robustness of cell sizing by impedance measurements, with or without machine learning
Detecting cells rotations for increasing the robustness of cell sizing by impedance measurements, with or without machine learning Open
The Coulter principle is a widespread technique for sizing red blood cells (RBCs) in hematological analyzers. It is based on the monitoring of the electrical perturbations generated by cells passing through a micro‐orifice, in which a conc…
View article: Impact of the membrane viscosity on the tank-treading behavior of red blood cells
Impact of the membrane viscosity on the tank-treading behavior of red blood cells Open
Numerical simulations are used to compare the impact of the internal fluid viscosity and the membrane viscosity on an isolated tank-treading red blood cell. Both decrease the tank-treading frequency, with moderate changes in the deformatio…
View article: Critical evaluation of kinetic schemes for coagulation
Critical evaluation of kinetic schemes for coagulation Open
Computational models of the coagulation cascade are used for a wide range of applications in bio-medical engineering such as drug and bio-medical device developments. However, a lack of robustness of numerical models has been highlighted w…
View article: Numerical simulation of time-resolved 3D phase-contrast magnetic resonance imaging
Numerical simulation of time-resolved 3D phase-contrast magnetic resonance imaging Open
A numerical approach is presented to efficiently simulate time-resolved 3D phase-contrast Magnetic resonance Imaging (or 4D Flow MRI) acquisitions under realistic flow conditions. The Navier-Stokes and Bloch equations are simultaneously so…
A theoretical investigation of the frisbee motion of red blood cells in shear flow Open
The dynamics of a single red blood cell in shear flow is a fluid–structure interaction problem that yields a tremendous richness of behaviors, as a function of the parameters of the problem. A low shear rates, the deformations of the red b…
Model-based assessment of the risks of viral transmission in non-confined crowds Open
This work aims to assess the risks of Covid-19 disease spread in diverse daily-life situations (referred to as scenarios) involving crowds of maskless pedestrians, mostly outdoors. More concretely, we develop a method to infer the global n…
Towards improved social distancing guidelines: Space and time dependence of virus transmission from speech-driven aerosol transport between two individuals Open
An examination of the concentration of a pathogen exhaled while speaking in a poorly ventilated space suggests that the probability of infection is relatively high for a few minutes of contact time at a separation of 1 meter separation dis…
View article: Intraventricular vector flow mapping 3-D by triplane Doppler echocardiography
Intraventricular vector flow mapping 3-D by triplane Doppler echocardiography Open
International audience
Speech can produce jet-like transport relevant to asymptomatic spreading of virus Open
Significance Medical reports and news sources raise the possibility that flows created during breathing, speaking, laughing, singing, or exercise could be the means by which asymptomatic individuals contribute to spread of the SARS-CoV-2 v…