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Top Forums Shell Programming and Scripting Building JSON command with bash script Post 303038996 by psysc0rpi0n on Thursday 19th of September 2019 06:05:36 AM
Old 09-19-2019
Ok, I'll have to go through your code and adapt it to my specific case. Later when I'm home, I'll try it.

Thanks
PsySc0rpi0n
 

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adapt(4rheolef) 						    rheolef-6.1 						   adapt(4rheolef)

NAME
adapt - mesh adaptation SYNOPSYS
geo adapt (const field& phi); geo adapt (const field& phi, const adapt_option_type& opts); DESCRIPTION
The function adapt implements the mesh adaptation procedure, based on the gmsh (isotropic) or bamg (anisotropic) mesh generators. The bamg mesh generator is the default in two dimension. For dimension one or three, gmsh is the only generator supported yet. In the two dimensional case, the gmsh correspond to the opts.generator="gmsh". The strategy based on a metric determined from the Hessian of a scalar governing field, denoted as phi, and that is supplied by the user. Let us denote by H=Hessian(phi) the Hessian tensor of the field phi. Then, |H| denote the tensor that has the same eigenvector as H, but with absolute value of its eigenvalues: |H| = Q*diag(|lambda_i|)*Qt The metric M is determined from |H|. Recall that an isotropic metric is such that M(x)=hloc(x)^(-2)*Id where hloc(x) is the element size field and Id is the identity d*d matrix, and d=1,2,3 is the physical space dimension. GMSH ISOTROPIC METRIC
max_(i=0..d-1)(|lambda_i(x)|)*Id M(x) = ----------------------------------------- err*hcoef^2*(sup_y(phi(y))-inf_y(phi(y))) Notice that the denominator involves a global (absolute) normalization sup_y(phi(y))-inf_y(phi(y)) of the governing field phi and the two parameters opts.err, the target error, and opts.hcoef, a secondary normalization parameter (defaults to 1). BAMG ANISOTROPIC METRIC
There are two approach for the normalization of the metric. The first one involves a global (absolute) normalization: |H(x))| M(x) = ----------------------------------------- err*hcoef^2*(sup_y(phi(y))-inf_y(phi(y))) The first one involves a local (relative) normalization: |H(x))| M(x) = ----------------------------------------- err*hcoef^2*(|phi(x)|, cutoff*max_y|phi(y)|) Notice that the denominator involves a local value phi(x). The parameter is provided by the optional variable opts.cutoff; its default value is 1e-7. The default strategy is the local normalization. The global normalization can be enforced by setting opts.additional="-AbsError". When choosing global or local normalization ? When the governing field phi is bounded, i.e. when err*hcoef^2*(sup_y(phi(y))-inf_y(phi(y))) will converge versus mesh refinement to a bounded value, the global normalization defines a metric that is mesh-independent and thus the adaptation loop will converge. Otherwise, when phi presents singularities, with unbounded values (such as corner singularity, i.e. presents peacks when represented in elevation view), then the mesh adaptation procedure is more difficult. The global normalization divides by quantities that can be very large and the mesh adaptation can diverges when focusing on the singularities. In that case, the local normalization is preferable. Moreover, the focus on singularities can also be controled by setting opts.hmin not too small. The local normalization has been choosen as the default since it is more robust. When your field phi does not present singularities, then you can swith to the global numbering that leads to a best equirepartition of the error over the domain. IMPLEMENTATION
struct adapt_option_type { typedef std::vector<int>::size_type size_type; std::string generator; bool isotropic; Float err; Float errg; Float hcoef; Float hmin; Float hmax; Float ratio; Float cutoff; size_type n_vertices_max; size_type n_smooth_metric; bool splitpbedge; Float thetaquad; Float anisomax; bool clean; std::string additional; bool double_precision; Float anglecorner; // angle below which bamg considers 2 consecutive edge to be part of // the same spline adapt_option_type() : generator(""), isotropic(true), err(1e-2), errg(1e-1), hcoef(1), hmin(0.0001), hmax(0.3), ratio(0), cutoff(1e-7), n_vertices_max(50000), n_smooth_metric(1), splitpbedge(false), thetaquad(std::numeric_limits<Float>::max()), anisomax(1e6), clean(false), additional("-RelError"), double_precision(false), anglecorner(0) {} }; template <class T, class M> geo_basic<T,M> adapt ( const field_basic<T,M>& phi, const adapt_option_type& options = adapt_option_type()); rheolef-6.1 rheolef-6.1 adapt(4rheolef)
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