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 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():
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()
