plugins.flavia — pyFormex 1.0.5 documentation

# Source code for plugins.flavia

    # $Id$
    ##
    ##  This file is part of pyFormex 1.0.5  (Sat Feb 16 10:40:32 CET 2019)
    ##  pyFormex is a tool for generating, manipulating and transforming 3D
    ##  geometrical models by sequences of mathematical operations.
    ##  Home page: http://pyformex.org
    ##  Project page:  http://savannah.nongnu.org/projects/pyformex/
    ##  Copyright 2004-2018 (C) Benedict Verhegghe (benedict.verhegghe@ugent.be)
    ##  Distributed under the GNU General Public License version 3 or later.
    ##
    ##  This program is free software: you can redistribute it and/or modify
    ##  it under the terms of the GNU General Public License as published by
    ##  the Free Software Foundation, either version 3 of the License, or
    ##  (at your option) any later version.
    ##
    ##  This program is distributed in the hope that it will be useful,
    ##  but WITHOUT ANY WARRANTY; without even the implied warranty of
    ##  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    ##  GNU General Public License for more details.
    ##
    ##  You should have received a copy of the GNU General Public License
    ##  along with this program.  If not, see http://www.gnu.org/licenses/.
    ##

    """
    Interface with flavia FE result files.

    (C) 2010 Benedict Verhegghe.
    """
    from __future__ import absolute_import, division, print_function
    from pyformex import zip

    from pyformex.arraytools import *
    from pyformex.mesh import Mesh, mergeMeshes
    from pyformex.plugins.fe_post import FeResult
    import shlex

    element_type_translation = {
        'quadrilateral': {
            4: 'quad4',
            8: 'quad8',
            9: 'quad9',
            },
        }
    element_results_count = {
        'vector': {
            2: 2,
            3: 3,
            },
        'matrix': {
            2: 3,
            3: 6,
            },
        }

    ######################### functions #############################

    def readMesh(fn):
        """Read a flavia mesh file.

        Returns a list of Meshes if succesful.
        """
        fil = open(fn, 'r')

        meshes = []
        for line in fil:
            if line.startswith('#'):
                continue
            elif line.startswith('Mesh'):
                s = shlex.split(line.lower())
                s = dict(zip(s[0::2], s[1::2]))
                print(s)
                ndim = int(s['dimension'])
                nplex = int(s['nnode'])
                eltype = element_type_translation[s['elemtype']][nplex]
                print("eltype = %s, ndim = %s" % (eltype, ndim))
            elif line.startswith('Coordinates'):
                coords = readCoords(fil, ndim)
                print("Coords %s" % str(coords.shape))
            elif line.startswith('Elements'):
                elems, props = readElems(fil, nplex)
                print("Elements %s %s" % (elems.shape, props.shape))
                meshes.append((elems, props))
            else:
                print(line)
        elems, props = [m[0] for m in meshes], [m[1] for m in meshes]
        maxnod = max([ e.max() for e in elems])
        coords = coords[:maxnod+1]
        return coords, elems, props, ndim

    def readCoords(fil, ndim):
        """Read a set of coordinates from a flavia file"""
        ncoords = 100
        coords = zeros((ncoords, 3), dtype=Float)
        for line in fil:
            if line.startswith('End Coordinates'):
                break
            else:
                s = line.split()
                i = int(s[0])
                x = [float(v) for v in s[1:]]
                while i >= ncoords:
                    coords = growAxis(coords, ncoords, axis=0, fill=0.0)
                    ncoords = coords.shape[0]
                coords[i-1, :ndim] = x
        return coords

    def readElems(fil, nplex):
        """Read a set of coordinates from a flavia file"""
        nelems = 100
        elems = zeros((nelems, nplex), dtype=Int)
        props = zeros((nelems), dtype=Int)
        for line in fil:
            if line.startswith('End Elements'):
                break
            else:
                s = line.split()
                i = int(s[0])
                e = [int(v) for v in s[1:nplex+1]]
                p = int(s[nplex+1])
                while i >= nelems:
                    elems = growAxis(elems, nelems, axis=0, fill=0)
                    props = growAxis(props, nelems, axis=0, fill=0)
                    nelems = elems.shape[0]
                elems[i-1] = e
                props[i-1] = p
        defined = elems.sum(axis=1) > 0
        return elems[defined]-1, props[defined]

    def readResults(fn, nnodes, ndim):
        """Read a flavia results file for an ndim mesh.

        """
        fil = open(fn, 'r')

        results = {}
        for line in fil:
            if line.startswith('#'):
                continue
            elif line.startswith('Result'):
                s = shlex.split(line.lower())
                name = s[1]
                restype = s[4]
                domain = s[5]
                print(domain)
                if domain != 'onnodes':
                    print("Currently only results on nodes can be read")
                    print("Skipping %s %s" % (name, domain))
                    nres = 0
                    continue
                nres = element_results_count[restype][ndim]
            elif line.startswith('Values'):
                if nres > 0:
                    result = readResult(fil, nnodes, nres)
                    print(name)
                    results[name] = result
            else:
                print(line)
        return results

    def readResult(fil, nvalues, nres):
        """Read a set of results from a flavia file"""
        values = zeros((nvalues, nres), dtype=Float)
        for line in fil:
            if line.startswith('End Values'):
                break
            else:
                s = line.split()
                i = int(s[0])
                x = [float(v) for v in s[1:]]
                values[i-1] = x
        return values

    from pyformex.plugins.fe import Model
    from pyformex.plugins.fe_post import FeResult

    def createFeResult(model, results):
        """Create an FeResult from meshes and results"""
        #model = Model(*mergeMeshes(meshes,fuse=False))
        DB = FeResult()
        DB.nodes = model.coords
        DB.nnodes = model.coords.shape[0]
        DB.nodid = arange(DB.nnodes)
        DB.elems = dict(enumerate(model.elems))
        DB.nelems = model.celems[-1]
        DB.Finalize()

        ndisp = results['displacement'].shape[1]
        nstrs = results['stress'].shape[1]
        DB.datasize['U'] = ndisp
        DB.datasize['S'] = nstrs
        for lc in range(1):  # currently only 1 step
            DB.Increment(lc, 0)
            DB.R['U'] = results['displacement']
            DB.R['S'] = results['stress']
        return DB

    def readFlavia(meshfile, resfile):
        """Read flavia results files

        Currently we only read matching pairs of meshfile,resfile files.
        """
        if meshfile:
            coords, elems, props, ndim = readMesh(meshfile)
        if resfile:
            R = readResults(resfile, coords.shape[0], ndim)
        M = Model(coords, elems)
        DB = createFeResult(M, R)
        DB.printSteps()
        return DB

    if __name__ == '__draw__':
        chdir('/home/bene/prj/pyformex')
        name = 'FeResult-001'
        meshfile = name+'.flavia.msh'
        resfile = utils.changeExt(meshfile, 'res')
        M = readMesh(meshfile)
        print(M.coords.shape, M.elems.shape)
        print(M.coords, M.elems)
        draw(M)
        R = readResults(resfile, M)
        DB = createFeResult(M, R)
        DB.printSteps()
        print(DB.R)
        print(DB.datasize)
        DB1 = FeResult()
        print(DB1.datasize)

        for key in [ 'U0', 'U1', 'U2', 'U3']:
            v = DB.getres(key)
            if v is not None:
                print("%s: %s" % (key, v.shape))

    # End