Since the version 4.5, the FreeFEM binary packages provides with a compiled PETSc library.
FreeFEM is now interfaced with ParMmg.
After Surface FEM, Line FEM is possible with a new mesh type
P1dc FE, basic FEM, mesh generation.
This new development allows to treat a 1d problem, such as a problem described on a 3d curve.
Abstract about Line FEM in FreeFEM.
new meshL type, refer to the section The type meshL in 3 dimension
new type of surface mesh:
the functionalities on the
meshLtype, it is necessary to load the plugin ”msh3”.
generator of meshL
segment, define multi
basic transformation are avalaible:
AddLayers, glue of
It is possible to build the underlying
meshSwith the function
ThS=buildBdMesh(ThS)builds the boundary domain associated to the
meshSThS and extract it by the command
new finite element space with curve finite element type
P1dcLagrange finite elements and possible to add a custumed finite element with the classical method (like a plugin).
as in the standard 2d, 3d, surface 3d case, the variational problem associated to surface PDE can be defined by using the keywords
varfto access to matrix and RHS vector
available operators are
onand the operator
int0dto define a Neumann boundary condition
meditmeshes meshL and solutions
2d or 3d view, with in 3d the option to visualize the elememt Normals at element (touch ‘T’) and the deformed domain according to it (touch ‘2’).
loading, saving of meshes and solution at FreeFEM’s format
“.mesh” mesh format file of Medit (P. Frey LJLL)
“.msh” for mesh and “.sol” data solution at freefem format
“.msh” data file of Gmsh (Mesh generator) (load “gmsh”)
vtk format for meshes and solutions (load “iovtk” and use the “.vtu” extension)
Allows to define and solve a 2d/3d BEM formulation and rebuild the associated potential. The document is in construction.
Added - new search algorithm for the element containing a point (more safe) in mesh of type mesh3, meshS, or meshL. - new function hasType to know if a PETSc component has been installed, e.g., hasType(“PC”, “hypre”) - eigenvalue problems on linear elements, cf. examples/eigen/LapEigen1DBeltrami.edp or examples/hpddm/laplace-beltrami-3d-line-SLEPc.edp - –download-cmake in PETSc configure if there is no CMake available - flags –with-[slepc|slepccomplex]-include and –with-[slepc|slepccomplex]-ldflags for when SLEPc has been built outside of FreeFEM or PETSc - interface to KSPSetResidualHistory and KSPGetIterationNumber - interface to mpiWaitAll - new function extract, allows to build a curve mesh from a 2d mesh (can extract a labeled boundary, apply a geometric transformation) - ffglut can plot a vectorial FE function in surface 3d - distributed ParMmg interface, cf. examples/hpddm/distributed-parmmg.edp or examples/hpddm/laplace-adapt-dist-3d-PETSc.edp - new parallel interpolator on non-matching meshes, cf. examples/hpddm/transfer.edp - ability to solve problems in single precision or with 64 bit integers - tool to read data form vtk file only in 3d (cf. plugin iovtk a first example examples/plugin/iovtk.edp) - tool to read/wrile ply file of meshL, mesh3, MeshS : Polygon File Format / Stanford Triangle Format do load “ioply”
Changed - new tgv values: -10 => zero row, -20 => zero row/column - Windows binary now shipped with PETSc/SLEPc - BEM examples are now in examples/mpi - plot border type is now in 3d (border 2d and 3d) - PETSc version 3.13.0
Fixed - –enable-download_package may now be used to download a single package, e.g., –enable-download_metis - compilation of PETSc under Windows - compilation of plugins when using static libraries - correct detection problem in FE type when use a vectorial FE - macro concatenation with spaces in arguments - correct bug in plugin/seq/Schur-Complement.cpp - correct ambiguity bug in plugin/seq/bfstream.cpp (reading real or integer) - compilation of plugin libff-mmap-semaphore.c under windows
new way to build matrix between 2d Finite element 2d and Curve finite element to do mortar (Thank to Axel ) , see first example examples/tutorial/mortar-DN-4-v4.5.edp
add Ns normal vector in R^3 on meshS (normal of the surface) of current point (to day Ns of [x,y,0] plan is [0,0,-1]) no be compatible to exterior normal.
add Tl tangent vector in R^3 on meshL (tangent vector of the line/curve) of current point
compile ffmaster / ffslave example under windows (thanks to email@example.com)
Boolean parameter spiltpbedge in buildmesh to split in to edge with two boundary vertices
interface to PETSc DMPlex, see examples/hpddm/DMPlex-PETSc.edp
function MatPtAP and transferMat for parallel interpolation between non-matching grids, see examples/hpddm/PtAP-2d-PETSc.edp or examples/hpddm/diffusion-mg-2d-PETSc.edp
preliminary interface to SVDSolve from SLEPc to compute singular value decompositions, see examples/hpddm/mf-2d-SLEPc.edp or examples/hpddm/helmholtz-2d-SLEPc-complex.edp
preliminary interface to NEPSolve from SLEPc to solve nonlinear eigenvalue problems, see examples/hpddm/nonlinear-2d-SLEPc-complex.edp
transpose parameter when constructing a Mat for defining a matrix-free transposed operation
interface to PetscMemoryGetCurrentUsage
add P2b, RT0, RT1 surface FE (P2bS, RT0S, RT1S))
add operator interpolate (2d->3d surface)
add operator x = A’*b; where x, b are array and A 2 dim array (full matrix) and generate an error in case of b’*A or b’*A expression
function MatLoad to load a PETSc Mat from disk, see examples/hpddm/MatLoad-PETSc.edp
possibility to assemble a symmetric HMatrix<complex> and to densify a HMatrix<complex> into a Mat<complex>
Changed - moved Htool to its new GitHub location - ScaLAPACK and MUMPS are not compiled by PETSc anymore if there is no Fortran compiler - MPICH is compiled by PETSc if no MPI is detected during configure, see https://community.freefem.org/t/feature-request-use-download-mpich-on-ubuntu/407 - PETSc version 3.13.5 - force –with-cudac=0 in make petsc-slepc, see https://github.com/FreeFem/FreeFem-sources/issues/141 - change DSL keyword P1dc3dL->P1dcL and P1dc3dS->P1dcS - rename view, hasType, changeSchur to respectively ObjectView, HasType, and ChangeSchur
Deprecated - rename changeNumbering, globalNumbering, originalNumbering, changeOperator, destroyRecycling, and attachCoarseOperator to respectively ChangeNumbering, GlobalNumbering, OriginalNumbering, ChangeOperator, DestroyRecycling, and AttachCoarseOperator - Nt the normal vector of the current (wrong on meshL) use Ns or Tl
Removed - augmentation routine from the PETSc plugin - MPIF77 variable
Fixed - lot of mistake in MeshL element add a example o check lot of thing tutomesh1d.edp - fixed problem of change of mesh when rebuild 2d mesh with buildmesh, …. (Thank to P. Jovilet to points this problem) - missing METIS library when using SuiteSparse compiled by PETSc - missing -fno-stack-protector when building PETSc on Windows, see https://community.freefem.org/t/error-loading-complex-petsc-slepc-library/370 - fixed ffglut for the plotting of FE array solution - fixed ffglut bug on MacOS Catalina , draw inn only half windows screen (Apple Bug ???) - correct P0VF finite element - abs function of array
Changed - change the language definition to use type as a construction function with named arguments for bem plugin - PETSc version 3.14.0 - ARPACK compiled by SLEPc - Mmg version 5.5.0 - -std=c++14 instead of -std=c++11 when possible
Removed - plugins thresholdings, symmetrizeCSR, and fflapack and associed example
Fixed - problem compilation with gfortran-10 of arpack and mumps (add -fallow-argument-mismatch flags)
Added - Bilaplacian example using Morley FE with PETSc, see examples/hpddm/bilaplacian-2d-PETSc.edp - Oseen problem preconditioned by PCD, see examples/hpddm/oseen-2d-PETSc.edp - SLEPc polynomial eigenvalue solver PEPSolve() - add trivial example to check periodic boundary condition on meshS , meshL , mesh3
examples/3d/periodic3.edp examples/3dSurf/periodicS.edp examples/3dCurve/periodicL.edp
Changed - PETSc version 3.14.2 - Mmg version 5.5.2 - link of ffglut so change in configure.ac and Makefile.am LIBS -> FF_LIBS and LIBS become empty
to remove default libs
change number of save plot in ffglut from 10 to 20 for O. Pironneau
Fixed - some memory leaks - the periodic boundary condition have wrong before first a sementic level of MeshS and MeshL case.
the new syntexe is for example: meshL Tl=segment(10); fespace Vl(Tl,P1,periodic=[,]); meshS Th=square3(10,10,[x*2*pi,y*2*pi]); fespace Vh2(Th,P1,periodic=[[1,x],[3,x],[2,y],[4,y]]);
fixed ‘*’ keyboard trick, to keep the viewpoint in ffglut or not.
Added - add P3 lagrange finite element on meshS and meshS - add new plugin `meshtool`to add tool to compute the number of connected components of a all kind of mesh
(mesh,mesh3,meshS,meshL) with 2 kind of connected components ones on interior part of the mesh (default) ans secondly on the closure of the mesh (see examples/hpddm/bConnectedComponents.edp ) add functions int[int] In=iminP1K(Th,u) or int[int] Ix=imaxP1K(Th,u) get the array min/max of value u[i] where i is vertex number on each element k, so we have u[Im[k]] = min u[i]/ i in k;
add in plugin bfstream to to read binary int (4 bytes) to read fortran file and try to pull tools to share the endiannes in progress
add gluemesh of array of MeshL and MeshS type
interface to PC_MG_GALERKIN_BOTH
Kronecker product of two sparse matrices matrix C = kron(A, B)
add lot of finite element on Mesh3, MeshS, MeshL of Discontinous Galerling Element in 3d : P1dc3d, P2dc3d, P3dc3d, P4dc3d , P0edge3d ,P0edgedc3d , P0face3d ,P0facedc3d , P0VF3d ,P0VFdc3d , on Surface : P1dcS, P2dcS, P3dcS, P4dcS , P0edgeS ,P0edgedcS , P0VFS ,P0VFdcS, on Curve : P1dcL, P2dcL, P3dcL, P4dcL , P0VFL ,P0VFdcL remark; the associated generic name existe of P1dc, P2dc, P0edge, P0VF and all dc finite element corresponding to no continuity across element.
add code of intallfaces to do Discontinous Galerkin formulation in 3d (in test FH.)
add dist function to a mesh , meshL, MeshS or mesh3
signeddistfunction to a meshL or meshS
add buildmesh functon to build a 2d mesh from a meshL (same as buildmesh see examples/3dCurve/border.edp)
Changed - Now the order to find MPI in configure is first if you have PETSC then take MPI from PETSc
otherwise use previous method
on MeshL defined with buildmeshL now the default label are 2*k-1 (resp. 2*k) for the begin (resp. end) of curve where k is the order of curve use in buildmeshL. So if you have one curve the labels are 1 and 2. And new the element label are te region number not the label. This element are not really test so be carfull.
Fixed - bug in Find triangle contening point in 2d (border case),
int Mesh::DataFindBoundary::Find(R2 PP,R *l,int & outside) const the parameter l not correclty return due to local variable.
set CFLAGS=-Wno-implicit-function-declaration to complie with Apple clang version 12.0.0 (clang-122.214.171.124) to remove following error: implicit declaration of function correct `3dCurve/basicGlue.edp`and add missing test
bugs in SLEPc SVDSolve() with a rectangular Mat
bugs in nElementonB for DG 3d formulation.
Added - ridgeangle named parameter in ExtractMeshL in msh3 plugin - DG formulation in 1d :
add integral of all border of element : intallBE(ThL) and unified the notation by adding intallBE(ThS) , intallBE(Th2), intallBE(Th3) nuVertex of now the vertex number of element in intallBE0d integral BoundaryBE, InternalBE to know if border element (BE) is on true boundary of not. update nElementonB in case on no manifold data (value greater > 2) in meshL, MeshS case .. add code to use jump, mean of test functuon on MeshL case. ( not in mesh3 ) to compute RHS.
add getcwd() function in shell plugin to get the current working dir
add nuVertex to get the vextex on element in some int?
Changed - PETSc 3.16.1
Deprecated - SLEPc and SLEPc-complex have been part of PETSc and PETSc-complex for multiple releases and are now deprecated
Fixed - examples/potential.edp correct problem in times loops and BC - tutorial/mortar-DN-4.edp correct problem of region number in meshL - fix problem in Curve mesh and intallBE , vertex number is wrong - portability issue on arm64-apple with make petsc-slepc - fix assertion failure with transfer and transferMat with some finite elements
Added - add computation scalar product of R3 example : ( N’*Tl) - add tools to do compution with R3 vector see tutorial/calculus.edp - add an example tutorial/tgv-test.edp see see what tgv do on matrix build. - add R3 Th.be(k).N to get the normal of boundary element (in all mesh type) - add R3 Th.be(k)[i].P to get the point (R3) of boundary vertices - add R3 Th.be(k).measure to get the measure of the boundary elment - add projection function to a mesh , meshL, MeshS or mesh3 with return a R3 point - see new example dist-projection.edp example in exemples - add dxx, dyy, dzz, dxy, .. on P2L finite element - add tools to compute solid angle : let R3 O; a given point, Th3 a mesh3 and ThS a meshS.
solidangle(O,Th3.be(ke)) // triangular face is the boundary face solidangle(O,Th3[k],nuface) // triangular face is face nuface of tet Th3[k] solidangle(O,ThS[k]) // triangular face is ThS[k] solidangle(O,A,B,C) // triangular face i (A,B,C) Volume(O,Th3.be(ke)) // O, triangular face is the boundary face Volume(O,Th3[k],nuface) // O, triangular face is face nuface of tet Th3[k] Volume(O,ThS[k]) // O, triangular face is ThS[k] Volume(O,A,B,C) // (O,A,B,C) tet ..
in bem pluging add array of HMatrix
examples/3d/Connectivite-3d.edp or /3dSurf/Connectivite-S.edp of test.
3 function mapk, mapkk, mapkk to set a function in fourier space with k parametre
R3 K; // le fourier variable allway 3d (sorry) int n1=16,n2=8, n3=4; real[int] tab1(nx,tab2(nx*ny),tab3(nx*ny*nz); mapk(tab1,K,sqr(K.x)); mapkk(tab2,ny,K,K.norm2); mapkkk(tab3,ny,nz,K,K.norm2); // Remark you can change K by P (current point)
in SurfaceMesh.ipd fonction to build a Isocaedron and a Sphere from this Isocaedron
new finite element on MeshS this finite element is the ortogonal of RT0 on surface, or Nelelec Finite Element on triangle with one DoF per mesh edge and where the DoF is the current on Edge in orientate edge by number of vertices.
plugin Element_P3pnc for new 2d finite element P3pnc (P3 + 2 bulles) noncoforming (continuite of P2 mod)
- and add 2 examples with this new finite element
- function to set dirichlet Boundary conditon on matrix A (real ou compex) trought an real[int]
(if none zero => set BC )
- setBC(A,au1,-2); and the example
Changed - the beaviour of linear solver UMFPACK, CHOLMOD in case of error , now FreeFEm exit on ExecError like in MUMPS - PETSc 3.17.0
Removed -map function in plugin dfft
Fixed - pow(int,int) now call int version not complex version.. - correct the normal the N implicite variable on meshL case - correct version dump in banner FreeFem++ - version 4.10 (V … - correct in CPU time on big mesh due to do bad HCode in HashTable.hpp - bug in array of finite element on meshhS, meshL (ie. fespace Vh(ThS,[P1,P1]); )