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Expand Up @@ -509,7 +509,7 @@ \subsection{VMS-ansatz and scale separation}
\end{align}
%----------------------------------------------------------------------------

In the spirit of the Variational MultiScale method (VMS) \cite{larsson_variationally_2010}, we introduce the \emph{ansatz} that the fields $\ta{u}\in\set{U}$ and $p\in\set{P}$ can be decomposed into macroscale (smooth) and subscale (fluctuating) parts inside each RVE via the unique orthogonal split $\set{U} = \set{U}^\macro \oplus \set{U}^\fluct$ and $\set{P} = \set{P}^\macro \oplus \set{P}^\fluct$.
In the spirit of the Variational MultiScale method (VMS) \cite{larsson_variationally_2010}, we introduce the \emph{ansatz} that the fields $\ta{u}\in\set{U}$ and $p\in\set{P}$ can be decomposed into macroscale (smooth) and subscale (fluctuating) parts inside each RVE via the unique hierarchical split $\set{U} = \set{U}^\macro \oplus \set{U}^\fluct$ and $\set{P} = \set{P}^\macro \oplus \set{P}^\fluct$.
As a result, we may assume that it is possible solve for the fluctuation fields $\ta{u}^\fluct\in\set{U}^\fluct$ and $p^\fluct\in\set{P}^\fluct$ as ``local approximations'' on each RVE for given macroscale solutions $\ta{u}^\macro\in\set{U}^\macro$ and $p^\macro\in\set{P}^\macro$, i.e.\ we construct the complete solution on each RVE as\footnote{Curly brackets $\{(\bullet)\}$ indicate implicit and/or nonlocal functional dependence on $(\bullet)$.}.
%------------------------------------------------------------------------------------------------------------
\begin{subequations}\label{eq4}
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167 changes: 87 additions & 80 deletions WCCM14/WCCM14_MikaelOEhman.tex
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Expand Up @@ -17,7 +17,7 @@
\usepackage{pgfplots}

%\pgfplotsset{compat=newest}
\pgfplotsset{compat=1.6}
%\pgfplotsset{compat=1.6}
\usetikzlibrary{shapes,arrows}

\newcommand{\highlight}[1]{{\color{red}#1}}
Expand Down Expand Up @@ -62,7 +62,7 @@

\usetheme[titleflower=true]{chalmers}
\title{
Computational homogenization of incompressible microstructures
On computational modeling of incompressible microstructures
}
\author[Mikael \"Ohman WCCM-ECCM --- 2014-07-22]{Mikael \"Ohman\\Kenneth Runesson\\Fredrik Larsson}
\institute{Department of Applied Mechanics\\ Chalmers University of Technology\\
Expand Down Expand Up @@ -107,15 +107,53 @@ \section{Title page}
% \end{center}
%\end{frame}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}
\frametitle{Motivation}
\begin{itemize}
\item Challenge in computational homogenization: Seamless transition of macroscale compressibility $\rightarrow$ incompressibility.
\item Practical application: Meltphase sintering of hardmetal producs: Porosity vanishes
\begin{center}
\includegraphics[scale=0.1]{figures/evolve_free_a}
\hspace{1em}
\includegraphics[scale=0.1]{figures/evolve_free_b}
\hspace{1em}
\includegraphics[scale=0.1]{figures/evolve_free_d}
\\
\includegraphics[scale=0.1]{figures/evolve_shear_a}
\hspace{1em}
\includegraphics[scale=0.1]{figures/evolve_shear_b}
\hspace{1em}
\includegraphics[scale=0.1]{figures/evolve_shear_d}
\end{center}
\end{itemize}
\end{frame}


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}
\frametitle{Motivation}
\begin{itemize}
\item Prototype problem (this presentation): Solid phase microstructure with heterogeneous subscale compressibility.
\\
Extreme situation: Uniform incompressibility $\rightarrow$ macroscale incompressibility

\item Need for comprehensive variational framework for homogenization.
Reference: Öhman et al.
\textit{On \ the variationally consistent computational homogenization of elasticity in the incompressible limit}.
AMSE (2014). Conditionally accepted
\end{itemize}
\end{frame}

\section{Outline}
\begin{frame}
\frametitle{Outline}

\begin{itemize}
\item Mixed formulation for incompressible elasticity
\item Problem with traditional boundary conditions
\item Variationally consistent homogenization
\item Macroscale problem
\item Weakly periodic boundary condition
\item Subscale problem
\item Numerical examples
\item Conclusions
\end{itemize}
\end{frame}
Expand All @@ -133,14 +171,14 @@ \section{Theory}
\\
\hat{e}(p) - \ta u\cdot\ta\nabla &= 0\text{ in } \Omega%, \quad \Omega = \cup_\alpha \Omega_\alpha
\end{align*}
\item Example material model, isotropic linear elasticity
\item Prototype material model: isotropic linear elasticity
\begin{gather*}
\hat{\ts\sigma}_\dev(\ts\epsilon_\dev) \defeq 2 G \ts\epsilon_\dev\\
\hat{\ts\sigma}_\dev(\ts\epsilon_\dev) = \ts\sigma + p\ts I,\quad \ts\epsilon_\dev \defeq [\ta u\outerp \diff]_\dev^\sym
\\
\hat{e}(p) \defeq -C\,p
\end{gather*}
\item For compressible cases, the bulk modulus is $ K = C^{-1}$
\item In the case of local compressibility, the bulk modulus is $ K = C^{-1}$
\item Subscript $\dev$ denotes deviatoric tensor: $\bullet_\dev = \bullet - \frac13 [\bullet:\ts I]\ts I$
\end{itemize}
\end{frame}
Expand All @@ -162,24 +200,6 @@ \section{Theory}
\end{itemize}
\end{frame}


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}
\frametitle{Problem with classical boundary conditions}
\begin{itemize}
\item As $C\to 0$, the volumetric part of the macroscopic strain can no longer be controlled in an RVE. Classical (Dirichlet and Neumann) boundary conditions for homogenization breaks down.
\item Solution presented:
\begin{center}
%\fullcite{ohman_variationally_2014}
Mikael Öhman, Kenneth Runesson, and Fredrik Larsson.
\\%[1em]
\textit{On the variationally consistent computational homogenization of elasticity in the incompressible limit}.
\\%[1em]
Advanced Modeling and Simulation in Engineering Sciences (2014). Under review
\end{center}
\end{itemize}
\end{frame}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}
\frametitle{Variationally Consistent Homogenization (VCH)}
Expand All @@ -197,62 +217,22 @@ \section{Theory}
p = p^\macro + p^\fluct
\end{align*}
\item Variationally Consistent Homogenization $\leadsto$ macroscale problem
\end{itemize}
\end{frame}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}
\frametitle{Variationally Consistent Macrohomogenity Condition}
\begin{itemize}
\item Variationally Consistent Macrohomogeneity condition (VCMC):
\begin{center}
\input{figures/VCMC.tikz}
\end{center}
\item $\leadsto$ restrictions on microscale boundary conditions
\item $z = (\ta u, p)$
\item A generalized Hill-Mandel condition
\item Generalized Hill-Mandel condition $\leadsto$ subscale modeling requirements
\end{itemize}
\end{frame}


% \section{Paper}
% \subsection{A}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% \begin{frame}
% \frametitle{Choice of prolongation}
% \begin{itemize}
% \item First order Taylor expansion of the velocity, and no macroscale pressure
% \begin{align*}
% \ta u^\macro &= \bar{\ta u} + [\bar{\ta u}\outerp\diff]\cdot[\ta x - \bar{\ta x}]
% \\
% p^\macro &= 0
% \end{align*}
% \item Constraint on the fluctuation $\ta u^\fluct$ within each RVE via the condition
% \begin{align*}
% \frac{1}{\volume} \int_{\Gamma_\rve} \ta u\outerp\ta n \dif S &= \bar{\ta u}\outerp\diff
% \end{align*}
% \item \textbf{Remark}: $\bar{\ta u}\outerp\diff$ represents the ``effective'' volume average for a porous domain
% \end{itemize}
% \end{frame}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% \begin{frame}
% \frametitle{Paper A summarized}
% \begin{center}
% \input{figures/box1.tikz}
% \end{center}
% \end{frame}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}
\frametitle{Hierarchical split}
\frametitle{Variationally Consistent Homogenization (VCH)}
\begin{itemize}
\item First order Taylor expansion of the displacement, and zeroth order expansion of the pressure
\begin{align*}
\ta u^\macro &= \bar{\ta u} + [\bar{\ta u}\outerp\diff]\cdot[\ta x - \bar{\ta x}]
\\
p^\macro &= \bar{p}
\end{align*}
where $(\bar{\ta u}, \bar{p})$ are macroscale fields with induced regularity requirements.
\item Constraints on the fluctuations $\ta u^\fluct$ and $p^\fluct$ within each RVE via the conditions
\begin{align*}
\homgen{\ta u\outerp\diff} &= \bar{\ta u}\outerp\diff
Expand Down Expand Up @@ -282,6 +262,28 @@ \section{Theory}
\end{itemize}
\end{frame}


\begin{frame}
\frametitle{Weak periodicity on RVE}
\begin{center}
\begin{tikzpicture}
%\tikzstyle{every node}=[font=\Large]
\node [inner sep=0pt,above right]{
\includegraphics[scale=.3]{figures/SwissCheeseFig}
};
\draw[<-, line width=.4mm] (5.0,4.0) to[out=0,in=-120] (6.0,5.0) node[right=1pt,black]{$\Gamma_\rve^+$};
\draw[<-, line width=.4mm] (4.0,5.0) to[out=60,in=120] (6.0,5.0);
\draw[<-, line width=.4mm] (0.0,1.0) to[out=180,in=60] (-1.0,0.0) node[left=1pt,black]{$\Gamma_\rve^-$};
\draw[<-, line width=.4mm] (1.0,0.0) to[out=-120,in=-60] (-1.0,0.0);
\draw[<-, line width=.6mm] (0.0,2.4) to[out=15,in=165] (5.0,2.4) node[right]{$\ta{\varphi}_\per$} ;
%\draw[<-, line width=.4mm] (4.6,1.7) .. controls +(right:0.5cm) and +(left:0.5cm) .. (6.0,1.0) node[right=1pt,black,text width=3cm,text badly ragged]{$\partial\Omega_{\rve,i}^\text{p}$};
\end{tikzpicture}
\end{center}
\begin{itemize}
\item $\jump{\bullet} = $ difference of $\bullet$ between $\Gamma_\rve^+$ and $\Gamma_\rve^-$ (mirror point)
\end{itemize}
\end{frame}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}
\frametitle{RVE problem --- Weakly Periodic b.c.}
Expand All @@ -308,27 +310,31 @@ \section{Theory}
&
\forall\;\delta\bar{e} \in \set R
\end{flalign*}
\item $\jump{\bullet} = $ difference of $\bullet$ between $\Gamma_\rve^+$ and $\Gamma_\rve^-$ (mirror point)
\end{itemize}
\end{frame}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}
\frametitle{RVE problem --- Dirichlet and Neumann b.c.}
\frametitle{RVE problem}
\begin{itemize}
\item For given macroscale variables $\bar{\ts\epsilon}_\dev$ and $\bar{p}$ obtain $\bar{\ts\sigma}_\dev$ and $\bar{e}$:
\item For given macroscale variables $\bar{\ts\epsilon}_\dev$ and $\bar{p}$, obtain $\bar{\ts\sigma}_\dev$ and $\bar{e}$ as output from the RVE problem:
\begin{itemize}
\item Dirichlet b.c.: find ($\ta{u},p,\bar{e})\in\set{U}'_\rve\times\set{P}_\rve\times\set R$
\item Dirichlet b.c.: find ($\ta{u},p,\bar{e})\in\set{U}^{D'}_\rve\times\set{P}_\rve\times\set R$
\begin{itemize}
\item Similar implementation to traditional Dirichlet b.c. only $\bar{e}$ is not controlled.
\item $\bar{\ts\sigma}_\dev$ response is post-processed reaction forces on RVE-boundary.
\item Note: $\bar{e}$ (volumetric part of macroscopic strain) is not controlled.
\item $\bar{\ts\sigma}_\dev$ is obtained from post-processing reaction forces on RVE-boundary.
\end{itemize}
\item Neumann b.c.: find ($\ta{u},p,\bar{\ts\sigma}_\dev)\in\set{U}_\rve\times\set{P}_\rve\times\set{R}^{3\times 3}_\dev$.
\begin{itemize}
\item Similar implementation to traditional Neumann b.c. only $\bar{p}$ is controlled.
\item $\bar{e}$ response is post-processed from displacement on RVE-boundary.
\item Note: $\bar{p}$ (volumetric part of macroscopic stress) is controlled.
\item $\bar{e}$ is obtained from post-processing displacements on RVE-boundary.
\end{itemize}
\end{itemize}
\item Remarks:
\begin{itemize}
\item Dirichlet/Neumann b.c. represent upper/lower bound of macroscale strain energy
\item Weakly periodic b.c. has been enforced approximately by polynomial basis for tractions in $\set{T}_\rve$ (costly, implemented but no results shown in this presentation).
\end{itemize}
\end{itemize}
\end{frame}

Expand All @@ -340,9 +346,10 @@ \section{Theory}
\end{center}
\end{frame}

\section{Numerical examples}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}
\frametitle{Statistical Volume Element (SVE)}
\frametitle{Numerical examples}
\begin{center}
\hspace{1cm}
\includegraphics[scale=0.05]{figures/rve6.png}
Expand All @@ -358,7 +365,7 @@ \section{Theory}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}
\frametitle{Homogenized shear and bulk modulus}
\frametitle{Numerical examples}
\begin{center}
%\input{figures/meanG.tikz}
\includegraphics[width=0.4\linewidth]{figures/meanG}
Expand All @@ -384,9 +391,9 @@ \section{Theory}
\begin{itemize}
\item Multiscale problem derived from fine-scale problem with VCH
\item Seamless transition to macroscopic incompressibility
\item Methodology is extensible to include pores and surface tension
\item Methodology is extendable to include pores and surface tension
%\item Modified Neumann-b.c. at no additional computational cost
\item Implementation of boundary conditions is available in the open source code OOFEM \texttt{www.oofem.org}
\item Implementation of RVE boundary conditions is available in the open source code OOFEM \texttt{www.oofem.org}
\end{itemize}
\end{frame}

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