def calculateCoeffs(self):
"""
If forces exist, the respective coefficients are calculated accordingly.
Otherwise a ValueError is raised.
:param L: Reference length
:type L: float
:param A: Reference area
:type A: float
"""
self.uInf = Utilities.mag(self.inletVelocity)
self.Re = FlowProperties.Re(L=self.L, u=self.uInf)
self.Fr = FlowProperties.Fr(L=self.L, u=self.uInf)
if self.forces:
self.t = self.forces[0]
self.resistances['RF'] = self.direction * self.forces[
abs(self.direction) + 3]
self.resistances['RT'] = self.resistances['RF'] +\
self.direction*self.forces[abs(self.direction)]
self.resistances['CF'] = Resistance.forceCoeff(
self.resistances['RF'], self.A, u=self.uInf)
self.resistances['CT'] = Resistance.forceCoeff(
self.resistances['RT'], self.A, u=self.uInf)
else:
raise ValueError
def updateInletVelocity(self):
"""
Reads and updates the inlet velocity. This has to be done without
pyFoam, as this takes *ages* for a file with precalculated
velocities.
"""
inletFound = False
with open(join(self.name, self.first, 'U'), 'r') as bc:
for line in bc:
for patchI in self.inletPatch:
if patchI in line:
inletFound = True
if inletFound:
if "uniform" in line:
vIn = line
break
numberRe = compile(r"[+-]? *(?:\d+(?:\.\d*)?|\.\d+)(?:[eE][+-]?\d+)?")
self.inletVelocity = [float(uI) for uI in findall(numberRe, vIn)]
self.uInf = Utilities.mag(self.inletVelocity)
self.Re = FlowProperties.Re(L=self.L, u=self.uInf)
self.Fr = FlowProperties.Fr(L=self.L, u=self.uInf)
def main():
parser = OptionParser(usage="usage: %prog [options] area ref.Length (case)",
version="%prog 1.0")
parser.add_option(
"-U", "--velocity",
action="store",
dest="U",
type="string",
default="False",
help="Velocity vector as a list \"[x,y,z]\". If nothing is\
stated, a inlet patch needs to be specified. From that\
patch, the velocity is read automatically."
)
parser.add_option(
"-i", "--inlet",
action="store",
dest="inletPatch",
type="string",
default="XMAX",
help="Name of the inlet patch. (default=XMAX)"
)
parser.add_option(
"-s", "--start",
action="store",
dest="startAtTime",
type="float",
default=0.0,
help="Starttime of the plotting interval, spanning from that\
time to the end. (default=0.0)"
)
parser.add_option(
"-d", "--deviation-start",
action="store",
dest="deviationInterval",
type="float",
default=0.5,
help="Specifies over which part of the plotted interval, the\
relative deviation between CF and ITTC\'57 as well as\
the average of CF should be calculated. (default=0.5)"
)
parser.add_option(
"-f",
action="store",
type="choice",
choices=['1','2','3'],
dest="direction",
default=1,
help="Main flow direction (1=x,2=y,3=z). (default=1)"
)
(options, args) = parser.parse_args()
if len(args) == 2:
caseDir = getcwd()
elif len(args) == 3:
caseDir = args[2]
else:
parser.error("wrong number of arguments")
area = float(args[0])
L = float(args[1])
U = eval(options.U)
startAtElement = 0
deviationStartElement = 0
case = Case.case(
caseDir,
archive=None,
paraviewLink=False,
inletPatch=options.inletPatch,
U=U
)
uInf = Utilities.mag(case.inletVelocity)
Re = FlowProperties.Re(L=L,u=uInf)
data = case.forces
t = data[0]
RF = abs(data[options.direction+3])
RT = RF + abs(data[options.direction])
# The list element of the time has to be figured out, beyond which the
# plotting should start.
if options.startAtTime > 0.0:
for i in range(0,len(data[0])):
if data[0][i] > options.startAtTime:
startAtElement = i
break
# Determine the start element for the deviation calculation
deviationStartElement = startAtElement + \
int(len(t[startAtElement:])*(1-options.deviationInterval))
# Gather all data
CF = Resistance.forceCoeff(RF,area,u=uInf)
CT = Resistance.forceCoeff(RT,area,u=uInf)
ittc57 = ones(len(CT))* SkinFriction.ittc57(Re=Re)
deviationList = CF*100.0/ittc57 - 100
# Calculate the relative error between CF and ITTC57 for the respective
# intervall
deviation = sum(deviationList[deviationStartElement:]) / \
len(deviationList[deviationStartElement:])
# Calculate mean value of CF for the respective interval
CFmean = mean(CF[deviationStartElement:])
fig = plt.figure()
plt.title("case: %s\nCFmean = %.2e, rel.Error = %.2f%%, Re = %.2e"
%(case.shortCasePath,CFmean,deviation,Re))
plt.grid(True)
ax1 = fig.add_subplot(111)
plt.grid(True)
ax2 = ax1.twinx()
CFPlot = ax1.plot(t[startAtElement:],CF[startAtElement:],'-',label='C_F',color='green')
ittc57Plot = ax1.plot(t[startAtElement:],
ittc57[startAtElement:],'-',label='ITTC57',color='red')
CTPlot = ax2.plot(t[startAtElement:],CT[startAtElement:],'-',label='C_T')
ax1.fill_between(t[deviationStartElement:],
CF[deviationStartElement:],
ittc57[deviationStartElement:],
color="green",alpha=0.5)
ax1.set_xlabel("simulation time [s]")
ax1.set_ylabel("CF [-]")
ax2.set_ylabel("CT [-]")
#ax1.set_ylim([
# 0,
# 1.2*max(CF[startAtElement].max(),ittc57[0])
# ])
lines = CFPlot+ittc57Plot+CTPlot
labels = [l.get_label() for l in lines]
plt.legend(
lines,
labels,
loc=9,
#bbox_to_anchor=(0., 1.02, 1., .102),
ncol=3,
mode="expand"
)
plt.show()
def main(argv=None):
"""
"""
parser = OptionParser(
usage="usage: %prog [options]",
version="%prog ",
description=__doc__
)
parser.add_option(
"-m",
action="store",
dest="mesh",
type="string",
default="",
help="Specifies the mesh to work on"
)
parser.add_option(
"-t",
action="store",
dest="template",
type="string",
default="template",
help="""Specifies the template case, that will be cloned.
(Default = template)"""
)
parser.add_option(
"-s", "--subpath",
action="store",
dest="subpath",
type="string",
default="",
help="""Optional subpath. This should be used to sort custom
parameter variations into the existing file structure.
%mesh/(%subpath, optional)/%beta/%v
"""
)
parser.add_option(
"-b",
action="store",
dest="beta",
type="float",
default=0.0,
help="Drift angle beta (Default = 0.0)"
)
parser.add_option(
"-n",
action="store",
dest="steps",
type="int",
default=10,
help="""Number of velocities between 0 and vMax.
v=0 m/s will be neglected. (Default = 10)"""
)
parser.add_option(
"-u",
action="store",
dest="u",
type="string",
default="0.0",
help="Service speed in m/s (Default = 0.0m/s)"
)
parser.add_option(
"-r",
action="store",
dest="dh",
type="float",
default=100.0,
help="""Characteristic length of the flow. For ships this
should be the shiplength. (Default = 100.0m)"""
)
group = OptionGroup(parser,"Flag Options")
group.add_option(
"--without-turbulence",
action="store_true",
dest="withoutTurbulence",
help="""Do not look for the turbulence model and set the
particular values in the boundary conditions. The values are calculated based
on the equations presented in the Fluent (R) handbook."""
)
parser.add_option_group(group)
(options, args) = parser.parse_args()
try:
u = float(options.u)
v = linspace(0, u, options.steps + 1)[1:]
except ValueError:
exec "v = array(%s)" %options.u
# Assemble the current working directory
workingDir = path.join(getcwd(),options.mesh)
# Put together the name of the target angle folder
driftAngleName = "beta%.2f" %options.beta
# Assemble the absolute path of the angle folder
if not options.subpath:
driftAngleDirectory = path.join(workingDir,driftAngleName)
else:
driftAngleDirectory = path.join(workingDir,options.subpath,driftAngleName)
# Check if the directory exists, that should store the cases for the current
# drift angle.
if not path.exists(driftAngleDirectory):
makedirs(driftAngleDirectory)
else:
raise IOError("Directory %s does already exist" %driftAngleDirectory)
template = Case.case(
path.join(getcwd(),options.mesh,options.template),
archive=None,
paraviewLink=False
)
template.addToClone("runCluster")
template.addToClone("customRegexp")
print "\nDrift angle beta = %.2f\n" %options.beta
i = 1
for vI in v:
print "Cloning case for v = %.3f" %vI
# Clone the template case and open velocity boundary condition
case = template.cloneCase(path.join(driftAngleDirectory,"v%02d" %i))
uFile = ParsedParameterFile(path.join(case.name,"0","U"))
# Rotate the velocity vector around z axis, according to the specified
# drift angle.
U = Vector(
vI*math.cos(math.radians(options.beta)),
vI*math.sin(math.radians(options.beta)),
0
)
# Update the boundary condition(s) with the respective values, that have
# been calculated previously.
uFile["internalField"].setUniform(U)
for b in ["XMIN","XMAX","YMIN","YMAX","ZMIN", "ZMAX"]:
patchType = uFile["boundaryField"][b]['type']
setPatch = False
for inlet in ['value', 'inletValue', 'tangentialVelocity']:
try:
uFile["boundaryField"][b][inlet].setUniform(U)
setPatch = True
except KeyError:
pass
if setPatch:
print "\tSetting patch: %s type %s" %(b, patchType)
# Write changes to the boundary conditions
uFile.writeFile()
if not options.withoutTurbulence:
print "\tFixing turbulence Dh =", options.dh
case.writeTurbulence(options.dh, Utilities.mag(U))
# Update counter
i += 1
print "\nDone!"
def main(argv=None):
"""
"""
parser = OptionParser(usage="usage: %prog [options]",
version="%prog ",
description=__doc__)
parser.add_option("-m",
action="store",
dest="mesh",
type="string",
default="",
help="Specifies the mesh to work on")
parser.add_option("-t",
action="store",
dest="template",
type="string",
default="template",
help="""Specifies the template case, that will be cloned.
(Default = template)""")
parser.add_option(
"-s",
"--subpath",
action="store",
dest="subpath",
type="string",
default="",
help="""Optional subpath. This should be used to sort custom
parameter variations into the existing file structure.
%mesh/(%subpath, optional)/%beta/%v
""")
parser.add_option("-b",
action="store",
dest="beta",
type="float",
default=0.0,
help="Drift angle beta (Default = 0.0)")
parser.add_option("-n",
action="store",
dest="steps",
type="int",
default=10,
help="""Number of velocities between 0 and vMax.
v=0 m/s will be neglected. (Default = 10)""")
parser.add_option("-u",
action="store",
dest="u",
type="string",
default="0.0",
help="Service speed in m/s (Default = 0.0m/s)")
parser.add_option("-r",
action="store",
dest="dh",
type="float",
default=100.0,
help="""Characteristic length of the flow. For ships this
should be the shiplength. (Default = 100.0m)""")
group = OptionGroup(parser, "Flag Options")
group.add_option("--without-turbulence",
action="store_true",
dest="withoutTurbulence",
help="""Do not look for the turbulence model and set the
particular values in the boundary conditions. The values are calculated based
on the equations presented in the Fluent (R) handbook.""")
parser.add_option_group(group)
(options, args) = parser.parse_args()
try:
u = float(options.u)
v = linspace(0, u, options.steps + 1)[1:]
except ValueError:
exec "v = array(%s)" % options.u
# Assemble the current working directory
workingDir = path.join(getcwd(), options.mesh)
# Put together the name of the target angle folder
driftAngleName = "beta%.2f" % options.beta
# Assemble the absolute path of the angle folder
if not options.subpath:
driftAngleDirectory = path.join(workingDir, driftAngleName)
else:
driftAngleDirectory = path.join(workingDir, options.subpath,
driftAngleName)
# Check if the directory exists, that should store the cases for the current
# drift angle.
if not path.exists(driftAngleDirectory):
makedirs(driftAngleDirectory)
else:
raise IOError("Directory %s does already exist" % driftAngleDirectory)
template = Case.case(path.join(getcwd(), options.mesh, options.template),
archive=None,
paraviewLink=False)
template.addToClone("runCluster")
template.addToClone("customRegexp")
print "\nDrift angle beta = %.2f\n" % options.beta
i = 1
for vI in v:
print "Cloning case for v = %.3f" % vI
# Clone the template case and open velocity boundary condition
case = template.cloneCase(path.join(driftAngleDirectory, "v%02d" % i))
uFile = ParsedParameterFile(path.join(case.name, "0", "U"))
# Rotate the velocity vector around z axis, according to the specified
# drift angle.
U = Vector(vI * math.cos(math.radians(options.beta)),
vI * math.sin(math.radians(options.beta)), 0)
# Update the boundary condition(s) with the respective values, that have
# been calculated previously.
uFile["internalField"].setUniform(U)
for b in ["XMIN", "XMAX", "YMIN", "YMAX", "ZMIN", "ZMAX"]:
patchType = uFile["boundaryField"][b]['type']
setPatch = False
for inlet in ['value', 'inletValue', 'tangentialVelocity']:
try:
uFile["boundaryField"][b][inlet].setUniform(U)
setPatch = True
except KeyError:
pass
if setPatch:
print "\tSetting patch: %s type %s" % (b, patchType)
# Write changes to the boundary conditions
uFile.writeFile()
if not options.withoutTurbulence:
print "\tFixing turbulence Dh =", options.dh
case.writeTurbulence(options.dh, Utilities.mag(U))
# Update counter
i += 1
print "\nDone!"