Line data    Source code

       1           0 : // Distributed under the MIT License.
       2             : // See LICENSE.txt for details.
       3             : 
       4             : #pragma once
       5             : 
       6             : #include "Utilities/Gsl.hpp"
       7             : 
       8             : /// \cond
       9             : class Matrix;
      10             : template <size_t>
      11             : class Mesh;
      12             : template <typename TagsList>
      13             : class Variables;
      14             : /// \endcond
      15             : 
      16             : namespace Spectral::filtering {
      17             : /*!
      18             :  * \brief Filters the tensors stored within a `Variables` being represented by
      19             :  * ZernikeB1 basis functions in their first dimension.
      20             :  *
      21             :  * \details The Cartoon method with spectral bases can be unstable for small
      22             :  * \f$x\f$, so we use ZernikeB1 bases with GaussRadauUpper quadrature to push
      23             :  * collocation points to higher inertial coordinates. This basis has
      24             :  * parity-dependent spectral space, so we must go to the proper modal space,
      25             :  * apply the exponential filter, and transform back.
      26             :  *
      27             :  * \see exponential_filter()
      28             :  */
      29             : template <typename VariablesTags>
      30           1 : void zernike_b1_exponential_filter(gsl::not_null<Variables<VariablesTags>*> u,
      31             :                                    const Mesh<3>& mesh, double alpha,
      32             :                                    unsigned half_power);
      33             : }  // namespace Spectral::filtering