Ken Kamrin
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View article: A Study Demonstrating That Using Gravitational Offset to Prepare Extraterrestrial Mobility Missions Is Misleading
A Study Demonstrating That Using Gravitational Offset to Prepare Extraterrestrial Mobility Missions Is Misleading Open
Recently, there has been a surge of international interest in extraterrestrial exploration targeting the Moon, Mars, the moons of Mars, and various asteroids. This contribution discusses how current state‐of‐the‐art Earth‐based testing for…
View article: Discrete Simulations of Fluid‐Driven Transport of Naturally Shaped Sediment Particles
Discrete Simulations of Fluid‐Driven Transport of Naturally Shaped Sediment Particles Open
The particles in natural bedload transport processes are usually aspherical and span a range of shapes and sizes, which is challenging to be represented in numerical simulations. We assemble existing numerical methods to simulate the trans…
View article: Experimentally validated DEM for large deformation powder compaction: mechanically-derived contact model and screening of non-physical contacts
Experimentally validated DEM for large deformation powder compaction: mechanically-derived contact model and screening of non-physical contacts Open
Despite widespread industrial reliance on powder compaction in manufacturing, a complete understanding of the underlying physical mechanisms that lead to pore structure, mechanical strength, and defects remains elusive, challenging ongoing…
View article: Using physics-based simulation towards eliminating empiricism in extraterrestrial terramechanics applications
Using physics-based simulation towards eliminating empiricism in extraterrestrial terramechanics applications Open
Recently, there has been a surge of international interest in extraterrestrial exploration targeting the Moon, Mars, the moons of Mars, and various asteroids. This contribution discusses how current state-of-the-art Earth-based testing for…
View article: Mixed material point method formulation, stabilization, and validation for a unified analysis of free-surface and seepage flow
Mixed material point method formulation, stabilization, and validation for a unified analysis of free-surface and seepage flow Open
This paper presents a novel stabilized mixed material point method (MPM) designed for the unified modeling of free-surface and seepage flow. The unified formulation integrates the Navier-Stokes equation with the Darcy-Brinkman-Forchheimer …
View article: Advances in Modeling Dense Granular Media
Advances in Modeling Dense Granular Media Open
This review focuses on how the modeling of dense granular media has advanced over the last 15 years. The jumping-off point of our review is the μ( I) rheology for dry granular flow, which opened the door to generic flow field modeling but …
View article: Stabilized mixed material point method for incompressible fluid flow analysis
Stabilized mixed material point method for incompressible fluid flow analysis Open
This paper proposes novel and robust stabilization strategies for accurately modeling incompressible fluid flow problems in the material point method (MPM). To address the modeling of Newtonian fluids with incompressibility constraints, a …
View article: A mechanically-derived contact model for adhesive elastic-perfectly plastic particles. Part II: Contact under high compaction--adding a bulk elastic response
A mechanically-derived contact model for adhesive elastic-perfectly plastic particles. Part II: Contact under high compaction--adding a bulk elastic response Open
In Part I of this two part series, we presented a multi-neighbor dependent contact model for adhesive elastic-plastic particles built upon the method of dimensionality reduction that is valid for the elastic and fully-plastic contact regim…
View article: A mechanically-derived contact model for adhesive elastic-perfectly plastic particles. Part I: Utilizing the method of dimensionality reduction
A mechanically-derived contact model for adhesive elastic-perfectly plastic particles. Part I: Utilizing the method of dimensionality reduction Open
In this two part series, we present a contact model able to capture the response of interacting adhesive elastic-perfectly plastic particles under a variety of loadings. In Part I, we focus on elastic through fully-plastic contact with and…
View article: Discrete simulations of fluid-driven transport of naturally shaped sediment particles
Discrete simulations of fluid-driven transport of naturally shaped sediment particles Open
{A numerical scheme is developed to simulate the transport of natural gravel. Starting with computerized tomographic (CT) scans of natural grains, our method approximates the shapes of these grains by “gluing” spheres of different sizes to…
View article: How Fast or How Many? Sources of Intermittent Sediment Transport
How Fast or How Many? Sources of Intermittent Sediment Transport Open
Near the threshold of grain motion, sediment transport is “on‐off” intermittent, characterized by large but rare bursts separated by long periods of low transport. Without models that can account for the effects of intermittency, measureme…
View article: Bioinspired, ingestible electroceutical capsules for hunger-regulating hormone modulation
Bioinspired, ingestible electroceutical capsules for hunger-regulating hormone modulation Open
The gut-brain axis, which is mediated via enteric and central neurohormonal signaling, is known to regulate a broad set of physiological functions from feeding to emotional behavior. Various pharmaceuticals and surgical interventions, such…
View article: Detecting hidden structures from a static loading experiment: topology optimization meets physics-informed neural networks
Detecting hidden structures from a static loading experiment: topology optimization meets physics-informed neural networks Open
Most noninvasive imaging techniques utilize electromagnetic or acoustic waves originating from multiple locations and directions to identify hidden geometrical structures. Surprisingly, it is also possible to image hidden voids and inclusi…
View article: Grain shape effects in bed load sediment transport
Grain shape effects in bed load sediment transport Open
Predictions of bed load sediment flux are notoriously imprecise despite widespread occurrence and importance in contexts ranging from river restoration to planetary exploration. Natural variations in grain size, shape and density are possi…
View article: Analysis and mitigation of spatial integration errors for the material point method
Analysis and mitigation of spatial integration errors for the material point method Open
Summary The material point method (MPM) is a robust numerical simulation approach for continuum mechanics problems involving large material deformations coupled to changing surface topographies. These types of problems are present in many …
View article: Mechanistic framework for reduced-order models in soft materials: Application to three-dimensional granular intrusion
Mechanistic framework for reduced-order models in soft materials: Application to three-dimensional granular intrusion Open
Soft materials often display complex behaviors that transition through apparent solid- and fluid-like regimes. While a growing number of microscale simulation methods exist for these materials, reduced-order models that encapsulate the mac…
View article: A second-order non-local model for granular flows
A second-order non-local model for granular flows Open
We determine a constitutive equation for developed three-dimensional granular flows based on a series of discrete element method simulations. In order to capture non-local phenomena, normal stress differences, and secondary flows, we exten…
View article: How fast or how many? Sources of intermittent sediment transport
How fast or how many? Sources of intermittent sediment transport Open
Near the threshold of grain motion, sediment transport is “on-off” intermittent, characterized by large but rare bursts separated by long periods of low transport. Without models that can account for the effects of intermittency, measureme…
View article: Fluid‐Driven Transport of Round Sediment Particles: From Discrete Simulations to Continuum Modeling
Fluid‐Driven Transport of Round Sediment Particles: From Discrete Simulations to Continuum Modeling Open
Bedload sediment transport is ubiquitous in shaping natural and engineered landscapes, but the variability in the relation between sediment flux and driving factors is not well understood. At a given Shields number, the observed dimensionl…
View article: Mechanistic framework for reduced-order models in soft materials: Application to three-dimensional granular intrusion
Mechanistic framework for reduced-order models in soft materials: Application to three-dimensional granular intrusion Open
Soft materials often display complex behaviors that transition through apparent solid- and fluid-like regimes. While a growing number of microscale simulation methods exist for these materials, reduced-order models that encapsulate the glo…
View article: Fluid-driven transport of round sediment particles: from discrete simulations to continuum modeling
Fluid-driven transport of round sediment particles: from discrete simulations to continuum modeling Open
Bedload sediment transport is ubiquitous in shaping natural and engineered landscapes, but the variability in the relation between sediment flux and driving factors is not well understood. At a given Shields number, the observed dimensionl…
View article: An incompressible Eulerian method for fluid–structure interaction with mixed soft and rigid solids
An incompressible Eulerian method for fluid–structure interaction with mixed soft and rigid solids Open
We present a general simulation approach for incompressible fluid–structure interactions in a fully Eulerian framework using the reference map technique. The approach is suitable for modeling one or more rigid or finitely deformable object…
View article: The Impact of Intermittency on Bed Load Sediment Transport
The Impact of Intermittency on Bed Load Sediment Transport Open
Sediment transport by wind or water near the threshold of grain motion is dominated by rare transport events. This intermittency makes it difficult to calibrate sediment transport laws, or to define an unambiguous threshold for grain entra…
View article: Data for "Fluid-driven transport of round sediment particles: from discrete simulations to continuum modeling"
Data for "Fluid-driven transport of round sediment particles: from discrete simulations to continuum modeling" Open
data/: Data from DEM-LBM simulations of round sediment particles and continuum models -single_sphere: single sphere tests of DEM-LBM for validation -flume: DEM-LBM flume tests, compared with the corresponding experiments -wide_wall_free: D…
View article: Data for "Fluid-driven transport of round sediment particles: from discrete simulations to continuum modeling"
Data for "Fluid-driven transport of round sediment particles: from discrete simulations to continuum modeling" Open
data/: Data from DEM-LBM simulations of round sediment particles and continuum models -single_sphere: single sphere tests of DEM-LBM for validation -flume: DEM-LBM flume tests, compared with the corresponding experiments -wide_wall_free: D…
View article: Fluid-driven transport of round sediment particles: from discrete simulations to continuum modeling
Fluid-driven transport of round sediment particles: from discrete simulations to continuum modeling Open
Data from DEM-LBM simulations of round sediment particles and continuum models:-single_sphere: single sphere tests of DEM-LBM for validation-flume: DEM-LBM flume tests, compared with the corresponding experiments-wide_wall_free: DEM-LBM si…
View article: Fluid-driven transport of round sediment particles: from discrete simulations to continuum modeling
Fluid-driven transport of round sediment particles: from discrete simulations to continuum modeling Open
Data from DEM-LBM simulations of round sediment particles and continuum models:-single_sphere: single sphere tests of DEM-LBM for validation-flume: DEM-LBM flume tests, compared with the corresponding experiments-wide_wall_free: DEM-LBM si…
View article: Time series for Benavides et al. " How fast or how many? Sources of intermittent sediment " (2022)
Time series for Benavides et al. " How fast or how many? Sources of intermittent sediment " (2022) Open
This zip file contains twofiles: 1) Loading_Data_Example.py, which is a python script which shows one how to load and handle the data. 2) time_series_HFHM.json, json files which contain the time-series data used in the paper Benavides et a…