# Adaptive modeling for free-surface flows

ESAIM: Mathematical Modelling and Numerical Analysis (2006)

- Volume: 40, Issue: 3, page 469-499
- ISSN: 0764-583X

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topPerotto, Simona. "Adaptive modeling for free-surface flows." ESAIM: Mathematical Modelling and Numerical Analysis 40.3 (2006): 469-499. <http://eudml.org/doc/249756>.

@article{Perotto2006,

abstract = {
This work represents a first step towards the simulation of the
motion of water in a complex hydrodynamic configuration, such as
a channel network or a river delta, by means of a suitable
“combination” of different mathematical
models. In this framework a wide spectrum of space and time scales is involved
due to the presence of physical phenomena of
different nature.
Ideally, moving from a hierarchy of hydrodynamic models, one should solve
throughout the whole domain the most complex model (with solution $u_\{\rm\{fine\}\}$) to accurately
describe all the physical features of the problem at hand. In our approach instead,
for a user-defined output functional $\{\cal F\}$, we aim to approximate,
within a prescribed tolerance τ, the value $\{\cal F\}(u_\{\rm\{fine\}\})$
by means of the quantity $\{\cal F\}(u_\{\rm\{adapted\}\})$, $u_\{\rm\{adapted\}\}$
being the so-called adapted solution solving the
simpler models on most of the computational domain while confining the complex ones only on a
restricted region. Moving from
the simplified setting where only two hydrodynamic models, fine and coarse, are considered, we
provide an efficient tool able to automatically select
the regions of the domain where the coarse
model rather than the fine one are to be solved, while guaranteeing $|\{\cal F\}(u_\{\rm\{fine\}\})
-\{\cal F\}(u_\{\rm\{adapted\}\})|$ below the tolerance τ.
This goal is achieved via a suitable a posteriori modeling error analysis
developed in the framework of a goal-oriented theory.
We extend the dual-based approach provided in
[Braack and Ern,
Multiscale Model Sim.1 (2003) 221–238],
for steady equations to the case of a generic time-dependent problem.
Then this analysis is specialized to the case we are
interested in, i.e. the free-surface flows simulation, by emphasizing
the crucial issue of the time discretization for both the primal and the dual
problems. Finally, in
the last part of the paper a widespread numerical validation is carried out.
},

author = {Perotto, Simona},

journal = {ESAIM: Mathematical Modelling and Numerical Analysis},

keywords = {Modeling adaptivity; a posteriori error estimate;
goal-oriented analysis;
free-surface flows; dual problem; finite elements.; modeling adaptivity; a posteriori error estimate; goal-oriented analysis; free-surface flows; finite elements},

language = {eng},

month = {7},

number = {3},

pages = {469-499},

publisher = {EDP Sciences},

title = {Adaptive modeling for free-surface flows},

url = {http://eudml.org/doc/249756},

volume = {40},

year = {2006},

}

TY - JOUR

AU - Perotto, Simona

TI - Adaptive modeling for free-surface flows

JO - ESAIM: Mathematical Modelling and Numerical Analysis

DA - 2006/7//

PB - EDP Sciences

VL - 40

IS - 3

SP - 469

EP - 499

AB -
This work represents a first step towards the simulation of the
motion of water in a complex hydrodynamic configuration, such as
a channel network or a river delta, by means of a suitable
“combination” of different mathematical
models. In this framework a wide spectrum of space and time scales is involved
due to the presence of physical phenomena of
different nature.
Ideally, moving from a hierarchy of hydrodynamic models, one should solve
throughout the whole domain the most complex model (with solution $u_{\rm{fine}}$) to accurately
describe all the physical features of the problem at hand. In our approach instead,
for a user-defined output functional ${\cal F}$, we aim to approximate,
within a prescribed tolerance τ, the value ${\cal F}(u_{\rm{fine}})$
by means of the quantity ${\cal F}(u_{\rm{adapted}})$, $u_{\rm{adapted}}$
being the so-called adapted solution solving the
simpler models on most of the computational domain while confining the complex ones only on a
restricted region. Moving from
the simplified setting where only two hydrodynamic models, fine and coarse, are considered, we
provide an efficient tool able to automatically select
the regions of the domain where the coarse
model rather than the fine one are to be solved, while guaranteeing $|{\cal F}(u_{\rm{fine}})
-{\cal F}(u_{\rm{adapted}})|$ below the tolerance τ.
This goal is achieved via a suitable a posteriori modeling error analysis
developed in the framework of a goal-oriented theory.
We extend the dual-based approach provided in
[Braack and Ern,
Multiscale Model Sim.1 (2003) 221–238],
for steady equations to the case of a generic time-dependent problem.
Then this analysis is specialized to the case we are
interested in, i.e. the free-surface flows simulation, by emphasizing
the crucial issue of the time discretization for both the primal and the dual
problems. Finally, in
the last part of the paper a widespread numerical validation is carried out.

LA - eng

KW - Modeling adaptivity; a posteriori error estimate;
goal-oriented analysis;
free-surface flows; dual problem; finite elements.; modeling adaptivity; a posteriori error estimate; goal-oriented analysis; free-surface flows; finite elements

UR - http://eudml.org/doc/249756

ER -

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