from issm.fielddisplay import fielddisplay
from issm.project3d import project3d
from issm.checkfield import checkfield
from issm.WriteData import WriteData
[docs]class frictioncoulomb(object):
"""
FRICTIONCOULOMB class definition
Usage:
frictioncoulomb=frictioncoulomb()
"""
def __init__(self): # {{{
self.coefficient = float('NaN')
self.coefficientcoulomb = float('NaN')
self.p = float('NaN')
self.q = float('NaN')
#set defaults
self.setdefaultparameters()
#}}}
def __repr__(self): # {{{
string="Basal shear stress parameters: Sigma_b = min(coefficient^2 * Neff ^r * |u_b|^(s-1) * u_b,\n coefficientcoulomb^2 * rho_i * g * (h-h_f)), (effective stress Neff=rho_ice*g*thickness+rho_water*g*bed, r=q/p and s=1/p)."
string="%s\n%s"%(string,fielddisplay(self,"coefficient","power law (Weertman) friction coefficient [SI]"))
string="%s\n%s"%(string,fielddisplay(self,"coefficientcoulomb","Coulomb friction coefficient [SI]"))
string="%s\n%s"%(string,fielddisplay(self,"p","p exponent"))
string="%s\n%s"%(string,fielddisplay(self,"q","q exponent"))
return string
#}}}
[docs] def extrude(self,md): # {{{
self.coefficient=project3d(md,'vector',self.coefficient,'type','node','layer',1)
self.coefficientcoulomb=project3d(md,'vector',self.coefficientcoulomb,'type','node','layer',1)
self.p=project3d(md,'vector',self.p,'type','element')
self.q=project3d(md,'vector',self.q,'type','element')
return self
#}}}
[docs] def setdefaultparameters(self): # {{{
return self
#}}}
[docs] def checkconsistency(self,md,solution,analyses): # {{{
#Early return
if 'StressbalanceAnalysis' not in analyses and 'ThermalAnalysis' not in analyses:
return md
md = checkfield(md,'fieldname','friction.coefficient','timeseries',1,'NaN',1,'Inf',1)
md = checkfield(md,'fieldname','friction.coefficientcoulomb','timeseries',1,'NaN',1,'Inf',1)
md = checkfield(md,'fieldname','friction.q','NaN',1,'Inf',1,'size',[md.mesh.numberofelements])
md = checkfield(md,'fieldname','friction.p','NaN',1,'Inf',1,'size',[md.mesh.numberofelements])
return md
# }}}
[docs] def marshall(self,prefix,md,fid): # {{{
WriteData(fid,prefix,'name','md.friction.law','data',7,'format','Integer')
WriteData(fid,prefix,'object',self,'fieldname','coefficient','format','DoubleMat','mattype',1,'timeserieslength',md.mesh.numberofvertices+1,'yts',md.constants.yts)
WriteData(fid,prefix,'object',self,'fieldname','coefficientcoulomb','format','DoubleMat','mattype',1)
WriteData(fid,prefix,'object',self,'fieldname','p','format','DoubleMat','mattype',2)
WriteData(fid,prefix,'object',self,'fieldname','q','format','DoubleMat','mattype',2)
# }}}