---
name: "limiter"
section: "4rheolef"
platform: "linux"
package: "librheolef-dev"
version: "7.0-2+b1"
release: "Debian 10 (Buster)"
platforms: ["linux"]
url: "https://new.carta.tech/limiter/4rheolef"
---

# limiter(4rheolef)

discontinuous Galerkin slope limiter

## NAME

**limiter** - discontinuous Galerkin slope limiter

## SYNOPSIS

 field limiter (const field& uh, options...);

## DESCRIPTION

This function returns a slope limited field for any supplied discontinuous approximation.

```
        geo omega ("square");
        space Xh (omega, "P1d");
        field uh (Xh);
        ...
        field vh = limiter(uh);

```

This function is still in development as a prototype: it supports only d=1 dimension and k=0 or 1 polynomial degrees. Its generalization to 2D and 3D geometries and any polynomial degree is in development.

## IMPLEMENTATION

```
struct limiter_option_type {
  bool active;
  Float theta; // > 1, see Coc-1998, P. 209
  Float M;     // M=max|u''(t=0)(x)| at x where u'(t)(x)=0 :extremas
  limiter_option_type() : active(true), theta(1.5), M(1) {}
};
template <class T, class M>
field_basic<T,M>
limiter (
   const field_basic<T,M>& uh,
   const T&               bar_g_S = 1.0,
   const limiter_option_type& opt = limiter_option_type());

```

## COPYRIGHT

Copyright (C) 2000-2018 Pierre Saramito \<Pierre.Saramito@imag.fr\> GPLv3+: GNU GPL version 3 or later \<http://gnu.org/licenses/gpl.html\>. This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.