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revision 1.8 by dimitri, Fri Jan 18 17:33:56 2008 UTC revision 1.9 by mlosch, Mon Jan 21 08:06:00 2008 UTC
# Line 1  Line 1 
1    % $Header$
2    % $Name$
3  \documentclass[12pt]{article}  \documentclass[12pt]{article}
4    
5  \usepackage[]{graphicx}  \usepackage[]{graphicx}
# Line 134  The maximum ice pressure $P_{\max}$, a m Line 136  The maximum ice pressure $P_{\max}$, a m
136  both thickness $h$ and compactness (concentration) $c$:  both thickness $h$ and compactness (concentration) $c$:
137  \begin{equation}  \begin{equation}
138    P_{\max} = P^{*}c\,h\,e^{[C^{*}\cdot(1-c)]},    P_{\max} = P^{*}c\,h\,e^{[C^{*}\cdot(1-c)]},
139  \label{icestrength}  \label{eq:icestrength}
140  \end{equation}  \end{equation}
141  with the constants $P^{*}$ and $C^{*}$. The nonlinear bulk and shear  with the constants $P^{*}$ and $C^{*}$. The nonlinear bulk and shear
142  viscosities $\eta$ and $\zeta$ are functions of ice strain rate  viscosities $\eta$ and $\zeta$ are functions of ice strain rate
# Line 435  These reduced viscosities lead to small Line 437  These reduced viscosities lead to small
437  which in turn can have a strong effect on solutions in the limit of  which in turn can have a strong effect on solutions in the limit of
438  nearly rigid regimes (arching and blocking, not shown).  nearly rigid regimes (arching and blocking, not shown).
439    
440    \ml{[Say something about performance? This is tricky, as the
441      perfomance depends strongly on the configuration. A run with slowly
442      changing forcing is favorable for LSR, because then only very few
443      iterations are required for convergences while EVP uses its fixed
444      number of internal timesteps. If the forcing in changing fast, LSR
445      needs far more iterations while EVP still uses the fixed number of
446      internal timesteps. I have produces runs where for slow forcing LSR
447      is much faster than EVP and for fast forcing, LSR is much slower
448      than EVP. EVP is certainly more efficient in terms of vectorization
449      and MFLOPS on our SX8, but is that a criterion?]}
450    
451  \subsection{C-grid}  \subsection{C-grid}
452  \begin{itemize}  \begin{itemize}
453  \item no-slip vs. free-slip for both lsr and evp;  \item no-slip vs. free-slip for both lsr and evp;
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