scholarly journals Transient Two-Way Molecular-Continuum Coupling with OpenFOAM and MaMiCo: A Sensitivity Study

Computation ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 128
Author(s):  
Helene Wittenberg ◽  
Philipp Neumann
Keyword(s):  
Domain Size ◽  
Sensitivity Study ◽  
Computational Effort ◽  
Lessons Learned ◽  
Computational Domain ◽  
Time Step ◽  
Coupling Algorithm ◽  
Long Term Behavior

Molecular-continuum methods, as considered in this work, decompose the computational domain into continuum and molecular dynamics (MD) sub-domains. Compared to plain MD simulations, they greatly reduce computational effort. However, the quality of a fully two-way coupled simulation result strongly depends on a variety of system-specific parameters, and the corresponding sensitivity is only rarely addressed in the literature. Using a state-flux molecular-continuum coupling algorithm, we investigated the influences of various parameters, such as the size of the overlapping region, the coupling time step and the quality of ensemble-based sampling of flow velocities, in a Couette flow scenario. In particular, we considered a big setup in terms of domain size and number of time steps, which allowed us to investigate the long-term behavior of the coupling algorithm close to the incompressible regime. While mostly good agreement was reached on short time scales, it was the long-term behavior which differed even with slightly differently parametrized simulations. We demonstrated our findings by measuring the error in velocity, and we summarize our main observations with a few lessons learned.

scholarly journals Leveraging Promising Policies to Support Long-Term Care Residents' Quality of Life Post-Pandemic

2021 ◽  
Vol 5 (Supplement_1) ◽  
pp. 369-370
Author(s):  
Deanne Taylor ◽  
Janice Keefe ◽  
Heather Cook
Keyword(s):  
Quality Of Life ◽  
Long Term Care ◽  
Lessons Learned ◽  
Term Care ◽  
Policy Language ◽  
Policy Makers ◽  
Pandemic Planning ◽  
Health Decision

Abstract Long-term care (LTC) is highly regulated and often the policy language is complex and in tension with residents’ quality of life goals. Prior to COVID-19, LTC policy levers prioritized safety over other quality domains such as privacy, dignity, spirituality, and comfort. During the pandemic, this focus on safety regulations, while important, intensified in ways that often negatively impacted residents’ overall quality of life. In this symposium, we share findings from a five- year research project where we conducted a unique and expansive review of regulatory policy across four Canadian jurisdictions. We highlight how 11 different quality of life domains are supported and which texts offering promising policy language to enhance a well-rounded quality of life for residents. These are timely insights to offer as policy-makers look to the future and consider the lessons learned from the pandemic. We contend that creating more LTC policy is not a timely pathway forward to LTC reform. Instead, we suggest that existing policy can be leveraged when applied within a resident-centred quality of life lens. We will guide attendees through examples of existing promising policies highlighting how they might leveraged in planning for a better LTC system. The discussion will be rooted in our unique resident-centred approach to policy analysis using specific domains of quality of life and then applied to four different perspectives: residents, families, staff and volunteers. Our discussant a Ministry of Health decision-maker will address the implications of our research for post-pandemic planning to improve resident quality of life

scholarly journals Transparent boundary condition for the calculation of eigenmodes in transversely infinite waveguides

2020 ◽  
Vol 18 ◽  
pp. 7-16
Author(s):  
Mikhail Patrushev ◽  
Wolfgang Ackermann ◽  
Thomas Weiland
Keyword(s):  
Boundary Condition ◽  
Signal Transmission ◽  
Domain Size ◽  
Computational Effort ◽  
Computational Domain ◽  
The Finite Element Method ◽  
Integration Technique ◽  
Memory Consumption ◽  
Open Waveguides ◽  
Kirchhoff Integral

Abstract. Waveguides play one of the key figures in today's electronics and optics for signal transmission. Corresponding simulations of electromagnetic wave transportation along these waveguides are accomplished by discretization methods such as the Finite Integration Technique (FIT) or the Finite Element Method (FEM). For longitudinally homogeneous and transversely unbounded waveguides these simulations can be approximated by closed boundaries. However, this distorts the original physical model and unnecessarily increases the size of the computational domain size. In this article we present a boundary condition for transversely open waveguides based on the Kirchhoff integral which has been implemented within the framework of FIT. The presented solution is compared with selected conventional methods in terms of computational effort and memory consumption.

Enhancing Transit Circulation in Resort Areas: Operational and Design Strategies

2000 ◽  
Vol 1735 (1) ◽  
pp. 79-83 ◽  
Author(s):  
Susan A. Thrasher ◽  
Thomas R. Hickey ◽  
Robert J. Hudome
Keyword(s):  
Public Transportation ◽  
Traffic Congestion ◽  
Lessons Learned ◽  
Design Strategies ◽  
Combination Strategy ◽  
Traffic Jam ◽  
Major Activity ◽  
Virginia Beach

Many resort areas and other major activity centers are facing transportation challenges as rising traffic congestion erodes the quality of a visitor’s experience. Many resort areas have turned to public transportation as an alternative strategy for visitor circulation, but these services often become enmeshed in the same traffic jam that they were intended to circumvent. The city of Virginia Beach, Virginia, undertook an aggressive, long-term effort to establish and enhance an effective transit circulation in its beachfront resort area through a combination of physical design improvements and operational management. The development and implementation of the combination strategy are described, and lessons learned that are relevant to other resort-area transit-circulator services are outlined.

scholarly journals Sensitivity study of the REMO regional climate model to domain size

2021 ◽  
Vol 18 ◽  
pp. 157-167
Author(s):  
Réka Suga ◽  
Otília A. Megyeri-Korotaj ◽  
Gabriella Allaga-Zsebeházi
Keyword(s):  
Regional Climate Model ◽  
Climate Model ◽  
Global Climate ◽  
Global Climate Model ◽  
Regional Climate ◽  
Domain Size ◽  
Sensitivity Study ◽  
Horizontal Resolution ◽  
Precipitation Indices

Abstract. In the framework of the KlimAdat national project, the Hungarian Meteorological Service (OMSZ) is aiming to perform 10 km horizontal resolution simulations with the 2015 version of the REMO regional climate model over Central and Eastern Europe. The long-term simulations were preceded by a 10-year long sensitivity study on domain size, which is summarised in this paper. We selected three different domains embedded in each other, which contain the whole area of the Danube and Tisza river catchments. Lateral boundary conditions were obtained from the 50 km resolution REMO driven by the MPI-ESM-LR global climate model. Simulations were performed for the period of 1970–1980 including 1-year spin-up. Monthly and seasonal means of daily 2 m temperature, precipitation sum and several precipitation indices were evaluated. Reference datasets were E-OBS 19.0 and CarpatClim-HU. We can conclude, that the selection of domain size has a larger impact on the simulation of precipitation, and in the case of the seasonal mean of the precipitation indices, the differences amongst the results obtained on each model domain exceed 10 %. In general, the smallest biases occurred on the largest domain, therefore further long-term simulations are being produced on this domain.

Prediction of Roll Damping Using Viscous Flow Solvers

2012 ◽  
Author(s):  
Manuel Manzke ◽  
Thomas Rung
Keyword(s):  
Domain Size ◽  
Building Blocks ◽  
Sensitivity Study ◽  
Convergence Criterion ◽  
Parameter Study ◽  
Floating Bodies ◽  
Time Step ◽  
Roll Damping ◽  
Damping Coefficients ◽  
Ranse Solver

This article illustrates the use of a RANSE solver coupled to a motion solver to predict the free roll decay and the associated damping coefficients of floating bodies. The necessary building blocks to perform such a prediction are described briefly. A sensitivity study for the convergence criterion, the time step, the domain size and the grid resolution is performed for a simple 2-dimensional barge. The results are compared to results from experiments. Furthermore a simulation for a free roll decay of a Navy Combatant is performed, considering the results of the parameter study for the Barge. Overall results indicate that the natural roll frequency can be well predicted, while the prediction of the roll damping coefficients is afflicted with some uncertainties.

scholarly journals Theoretical Investigation of Nonlinear Time-Dependent Behavior of Two-Way High-Strength Concrete Walls

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Yue Huang ◽  
Rui Rao ◽  
Yonghui Huang ◽  
Zilin Zhong
Keyword(s):  
Geometric Nonlinearity ◽  
High Strength Concrete ◽  
High Strength ◽  
Time Dependent ◽  
Fourier Series Expansion ◽  
Time Step ◽  
Strength Concrete ◽  
Dependent Behavior ◽  
Long Term Behavior

High-strength concrete (HSC) walls have been increasingly used in the past decades. However, the time-dependent behavior of HSC wall panels in two-way action was not investigated, and the time effect of creep is not included in the design codes in most countries. For this purpose, the nonlinear long-term behavior of two-way HSC wall is investigated in this paper. A theoretical model is developed using time-stepping analysis considering geometric nonlinearity and creep of concrete. A rheological material model that is based on the generalized Maxwell chain is adopted to model the concrete creep. Von Karman plate theory is used to derive the incremental governing equations. The equations are solved numerically at each time step based on a Fourier series expansion of the deformations and loads and numerical multiple shooting method. It shows that the model can effectively predict the time-dependent behavior of two-way HSC panels, where the out-of-plane deflection and internal bending moments increase with time due to the combined effects of creep and geometric nonlinearity, which may ultimately lead to creep buckling failures. A parametric study shows that the long-term behavior of the panel is very sensitive to the in-plane load level and eccentricity, slenderness ratio, aspect ratio, and edge support conditions.

Long-Term Behavior and Quality of Life After Corrective Cardiac Surgery in Infancy for Tetralogy of Fallot or Ventricular Septal Defect

2007 ◽  
Vol 28 (5) ◽  
pp. 346-354 ◽  
Author(s):  
H. H. Hövels-Gürich ◽  
K. Konrad ◽  
D. Skorzenski ◽  
R. Minkenberg ◽  
B. Herpertz-Dahlmann ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Cardiac Surgery ◽  
Ventricular Septal Defect ◽  
Tetralogy Of Fallot ◽  
Septal Defect ◽  
Long Term Behavior

Lessons Learned: Career Challenges in Training the Next Generation of Interdisciplinary Health Scientists

2016 ◽  
Vol 3 (4) ◽  
pp. 234-238
Author(s):  
Jennifer M. Reingle Gonzalez
Keyword(s):  
Professional Training ◽  
Training And Development ◽  
Lessons Learned ◽  
Early Career ◽  
Training And Research ◽  
Short And Long Term ◽  
And Training ◽  
Society Today

Interdisciplinary science, defined by the National Academies as “a mode of research by teams of individuals that integrates information, data, techniques, tools, perspectives, concepts, and/or theories from two or more disciplines . . . to advance fundamental understanding or to solve problems whose solutions are beyond the scope of a single discipline,” has come to the forefront as necessary to solve the complex social problems, such as obesity, violence, and addiction, facing our society today. Interdisciplinary training and research is a novel idea in theory, although execution is inconsistent. Because there are no structured curricula, professional training and development occur differently for every emerging scientist. My goal in writing this article is to continue the dialogue to improve the consistency and quality of interdisciplinary research and training for future cohorts of health scientists. The purpose of this article is to describe challenges I encountered, including short- and long-term practical approaches for career development from the perspective of an early career, interdisciplinary researcher.

Thinking Beyond Language: Intervention for Severe Aphasia

2009 ◽  
Vol 19 (1) ◽  
pp. 15-22 ◽  
Author(s):  
Nina Simmons-Mackie
Keyword(s):  
Quality Of Life ◽  
Communication Training ◽  
Language Intervention ◽  
Specific Training ◽  
Environmental Support ◽  
Total Communication ◽  
Communication Partners

Abstract Purpose: This article addresses several intervention approaches that aim to improve life for individuals with severe aphasia. Because severe aphasia significantly compromises language, often for the long term, recommended approaches focus on additional domains that affect quality of life. Treatments are discussed that involve increasing participation in personally relevant life situations, enhancing environmental support for communication and participation, and improving communicative confidence. Methods: Interventions that have been suggested in the aphasia literature as particularly appropriate for people with severe aphasia include training in total communication, training of communication partners, and activity specific training. Conclusion: Several intervention approaches can be implemented to enhance life with severe aphasia.

Maximizing Outcomes in Group Treatment of Aphasia: Lessons Learned From a Community-Based Center

2014 ◽  
Vol 24 (3) ◽  
pp. 100-105 ◽  
Author(s):  
Darlene Williamson
Keyword(s):  
Group Treatment ◽  
Treatment Protocol ◽  
Lessons Learned ◽  
Group Program ◽  
Community Based ◽  
Multiple Treatment ◽  
Use Of Technology ◽  
Communication Impairments ◽  
Treatment Settings

Given the potential of long term intervention to positively influence speech/language and psychosocial domains, a treatment protocol was developed at the Stroke Comeback Center which addresses communication impairments arising from chronic aphasia. This article presents the details of this program including the group purposes and principles, the use of technology in groups, and the applicability of a group program across multiple treatment settings.

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