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\title[PRENOLIN April 2014 Meeting]
      {PRENOLIN, Comments, April 2014}

%\subtitle
%{Include Only If Paper Has a Subtitle}

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{Boris Jeremi{\'c} and Kohei Watanabe}
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{\small PRENOLIN meeting, \\
Nice, France \\
April 2014}

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\section{PRENOLIN Comments}
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\begin{frame}
\frametitle{(US-NRC, CNSC, DOE) ESSI Simulator System}

\begin{itemize}

\item {\bf ESSI-Program} is a 3D, nonlinear, time domain, 
parallel finite element program specifically developed for
Hi-Fi modeling  and  simulation  of  Earthquake  Soil/Rock  Structure
Interaction of NPPs on ESSI-Computer. \
%The NRC ESSI Program is based on
%a  number of public domain numerical libraries developed at UCD as well as those
%available  on  the  web,  that  are  compiled  and  linked  together to form the
%executable  program (NRC-ESSI-Program). Significant effort is devoted to development
%of  verification  and  validation  procedures,  as  well  as  on  development of
%extensive  documentation.  NRC-ESSI-Program  is  in  public  domain  and is licensed
%through the Lesser GPL.

%\vspace*{0.3cm}
\vspace*{0.1cm}
\item {\bf ESSI-Computer} is a distributed memory 
parallel computer, a cluster of clusters with multiple performance  
processors and multiple performance networks.  
%Compute  nodes are Shared Memory Parallel
%(SMP)  computers,  that  are  connected,  using  high  speed  network(s), into a
%Distributed Memory Parallel (DMP) computer.

%\vspace*{0.3cm}
\vspace*{0.1cm}
\item  {\bf  ESSI-Notes} are    a  hypertext  documentation  system  (Theory and
Formulation,  Software  and  Hardware,  Verification  and  Validation,  and Case
Studies  and  Practical  Examples)  detailing  modeling  and  simulation of ESSI
problems.
%
%the
%NRC-ESSI-Program  code  API (application Programming Interface) and DSLs (Domain
%Specific Language).
%%NRC-ESSI-Notes,    developed  by Boris Jeremic and collaborators, are in public
%domain
%%and  are  licensed  under a Creative Commons Attribution-ShareAlike 3.0 Unported
%%License.
%
%\vspace*{0.3cm}
\end{itemize}

\end{frame}






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\begin{frame}
\frametitle{Questions and Answers}

\begin{itemize}

%\vspace*{0.5cm}
\item[Q:] Did you have difficulties with the changes proposed in iteration 2?
{\bf A:} We are still using rigid base, since we did not
have time to work out the full wave field for using analytic seismic input 
(input is SHAKE oriented). Also used more points (space, time), interpolation
%
%(as input
%provided by PRENOLIN for half-space is geared toward SHAKE...)

\item[Q:]  What  is  your  expectation  on  the  variability of the results for this
iteration?
{\bf  A:}  There  was  no  real  Verification  (yet)  of  codes, leading to
variability (large or small)

\item[Q:] Do you have a proposal for simple calculations to test the numerical method (implementation of attenuation and non-linear model). 
{\bf A:} Full Verification (see next slide)

\item[Q:] Something that you want to highlight?
{\bf A:} Material modeling uncertainty and loading uncertainty! (see next to last slide)

\end{itemize}

\end{frame}


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\begin{frame}
\frametitle{Complete Verification}

\begin{itemize}

\item Code verification (programming bugs, coverage, portability)

\item Solver verification (pivoting, numerical errors)

\item Time marching algorithm verification (Newmark, Hilber-Hughes-Taylor, \&c.)

\item Constitutive integration algorithm verification (linear elastic, nonlinear
el., visco-el., elastic-plastic, 1D, 2D, 3D)

\item Finite element(s) verification (control loads and displ.)

\item Damping, energy dissipation (viscous, frictional, numerical) verification

\item Wave propagation algorithm verification (control motions, wavelets)

\item  Parametric study for a wide range of parameters for each case (trying to "break"
the model)


\end{itemize}

\end{frame}




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\begin{frame}
\frametitle{Uncertainty: Material Modeling and Loading}

\begin{itemize}

\item   Material   modeling   based   on   uncertain   data  (measuring  errors,
transformation errors, spatial variability)

\item Seismic loading is uncertain 


\end{itemize}

\vspace*{-0.9cm} 

\begin{figure}[!hbpt]
\begin{center}
\hspace*{-0.5cm}
\includegraphics[width=4cm]{/home/jeremic/tex/works/Thesis/KonstantinosKarapiperis/Soil_Uncertainty_Report_Pdf_Cdf_Figures/FieldECdf.pdf}
\includegraphics[width=4cm]{/home/jeremic/tex/works/Thesis/KonstantinosKarapiperis/Soil_Uncertainty_Report_Pdf_Cdf_Figures/FieldPhiCdf.pdf}
\includegraphics[width=4cm]{/home/jeremic/tex/works/Thesis/KonstantinosKarapiperis/Soil_Uncertainty_Report_Pdf_Cdf_Figures/FieldSuCdf.pdf}
\end{center}
\end{figure}

\vspace*{-0.3cm} 

Elastic Modulus 
\hspace*{1.2cm} 
Friction Angle
\hspace*{1.2cm} 
Shear Strength
         
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\begin{frame}
\frametitle{Summary (Verification $\rightarrow$ Validation)}

\begin{itemize}

\item    Verification:  detailed, address all the components
separately   (separate  elastic,  visco-elastic,  (cannot  expect
visco-elastic to have smaller differences, \&c.)


\item  Verification,  same  models (linear elastic for example) should have "no"
variability

\item Volume change for soil (large influence on "1D" (actually 3D) response, we
use a full 3D models


\item Uncertainty (material modeling, loading) is controlling

\end{itemize}


\begin{figure}[!hbpt]
\begin{center}
\vspace*{-0.5cm}
\hspace*{-0.5cm}
\includegraphics[width=4cm]{/home/jeremic/tex/works/Thesis/NimaTafazzoli/MeshSize/figs/3_4_6/Input_Displacement.pdf}
\includegraphics[width=4cm]{/home/jeremic/tex/works/Thesis/NimaTafazzoli/MeshSize/figs/3_4_6/displacement.pdf}
\includegraphics[width=4cm]{/home/jeremic/tex/works/Thesis/NimaTafazzoli/MeshSize/figs/3_4_6/FFT.pdf}
\end{center}
\end{figure}


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