Georg_Brantegger/Python-DT_Slot_3
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fixed a coding mistake that lead to

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a missbehavior in the time evolution of the
reservoir
This commit is contained in:
Georg ´Brantegger
2022-07-28 16:26:04 +02:00
parent e90406d90b
commit dc5bcfe7f8
5 changed files with 135 additions and 2087 deletions
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46
Ausgleichsbecken/Ausgleichsbecken_class_file.py
View File

@@ -72,11 +72,13 @@ class Ausgleichsbecken_class:
def set_initial_level(self,initial_level):
# sets the level in the reservoir and should only be called during initialization
if self.level == '--':
self.level = initial_level
self.volume = self.update_volume()
self.level = initial_level
else:
raise Exception('Initial level was already set once. Use the .update_level(self,timestep) method to update level based on net flux.')
def set_level(self,level):
self.level = level
def set_influx(self,influx):
# sets influx to the reservoir in m³/s
# positive influx means that liquid flows into the reservoir
@@ -95,15 +97,14 @@ class Ausgleichsbecken_class:
def set_pressure(self,pressure):
# sets the static pressure present at the outlet of the reservoir
# units are used to convert and display the pressure
self.pressure = pressure
self.pressure = pressure
def set_steady_state(self,ss_influx,ss_level,display_pressure_unit):
# set the steady state (ss) condition in which the net flux is zero
# set pressure acting on the outflux area so that the level stays constant
ss_outflux = ss_influx
ss_influx_vel = ss_influx/self.area
ss_outflux_vel = ss_outflux/self.area_outflux
ss_influx_vel = abs(ss_influx/self.area)
ss_outflux_vel = abs(ss_outflux/self.area_outflux)
ss_pressure = self.density*self.g*ss_level+self.density*ss_outflux_vel*(ss_influx_vel-ss_outflux_vel)
self.set_influx(ss_influx)
@@ -115,6 +116,7 @@ class Ausgleichsbecken_class:
def get_info(self, full = False):
new_line = '\n'
p = pressure_conversion(self.pressure,self.pressure_unit,self.pressure_unit_print)
outflux_vel = self.outflux/self.area_outflux
if full == True:
@@ -129,7 +131,7 @@ class Ausgleichsbecken_class:
f"Volume in reservoir = {self.volume:<10} {self.volume_unit_print} {new_line}"
f"Current influx = {self.influx:<10} {self.flux_unit_print} {new_line}"
f"Current outflux = {self.outflux:<10} {self.flux_unit_print} {new_line}"
f"Current outflux vel = {round(self.outflux_vel,3):<10} {self.velocity_unit_print} {new_line}"
f"Current outflux vel = {round(outflux_vel,3):<10} {self.velocity_unit_print} {new_line}"
f"Current pipe pressure = {round(p,3):<10} {self.pressure_unit_print} {new_line}"
f"Simulation timestep = {self.timestep:<10} {self.time_unit_print} {new_line}"
f"Density of liquid = {self.density:<10} {self.density_unit_print} {new_line}"
@@ -142,7 +144,7 @@ class Ausgleichsbecken_class:
f"Volume in reservoir = {self.volume:<10} {self.volume_unit_print} {new_line}"
f"Current influx = {self.influx:<10} {self.flux_unit_print} {new_line}"
f"Current outflux = {self.outflux:<10} {self.flux_unit_print} {new_line}"
f"Current outflux vel = {round(self.outflux_vel,3):<10} {self.velocity_unit_print} {new_line}"
f"Current outflux vel = {round(outflux_vel,3):<10} {self.velocity_unit_print} {new_line}"
f"Current pipe pressure = {round(p,3):<10} {self.pressure_unit_print} {new_line}"
f"----------------------------- {new_line}")
@@ -157,9 +159,6 @@ class Ausgleichsbecken_class:
def get_current_outflux(self):
return self.outflux
def get_current_volume(self):
return self.volume
def get_current_pressure(self):
return self.pressure
@@ -174,19 +173,14 @@ class Ausgleichsbecken_class:
# cannot set new level directly in this method, because it gets called to calcuate during the Runge Kutta
# to calculate a ficticious level at half the timestep
net_flux = self.influx-self.outflux
delta_V = net_flux*timestep
new_level = (self.volume+delta_V)/self.area
delta_level = net_flux*timestep/self.area
new_level = (self.level+delta_level)
return new_level
def update_volume(self):
# sets volume in reservoir based on self.level
return self.level*self.area
def update_pressure(self):
influx_vel = self.influx/self.area
outflux_vel = self.outflux/self.area_outflux
influx_vel = abs(self.influx/self.area)
outflux_vel = abs(self.outflux/self.area_outflux)
p_new = self.density*self.g*self.level+self.density*outflux_vel*(influx_vel-outflux_vel)
return p_new
def timestep_reservoir_evolution(self):
@@ -209,8 +203,10 @@ class Ausgleichsbecken_class:
ynp1 = yn + dt/6*(FODE_function(Y1,h,A,A_a,p,rho,g)+2*FODE_function(Y2,h_hs,A,A_a,p_hs,rho,g)+ \
2*FODE_function(Y3,h_hs,A,A_a,p_hs,rho,g)+ FODE_function(Y4,h,A,A_a,p,rho,g))
self.outflux = ynp1*A_a
self.level = self.update_level(dt)
self.volume = self.update_volume()
self.pressure = self.update_pressure()
new_outflux = ynp1*A_a
new_level = self.update_level(dt)
new_pressure = self.update_pressure()
self.set_outflux(new_outflux)
self.set_level(new_level)
self.set_pressure(new_pressure)

18
Ausgleichsbecken/Ausgleichsbecken_test_steady_state.ipynb
View File

@@ -2,7 +2,7 @@
"cells": [
{
"cell_type": "code",
"execution_count": 13,
"execution_count": 1,
"metadata": {},
"outputs": [],
"source": [
@@ -21,7 +21,7 @@
},
{
"cell_type": "code",
"execution_count": 14,
"execution_count": 2,
"metadata": {},
"outputs": [],
"source": [
@@ -51,7 +51,7 @@
},
{
"cell_type": "code",
"execution_count": 15,
"execution_count": 3,
"metadata": {},
"outputs": [],
"source": [
@@ -71,20 +71,20 @@
"\n",
"# for while loop\n",
"total_min_level = 0.01 # m\n",
"total_max_time = 1 # s\n",
"total_max_time = 100 # s\n",
"\n",
"nt = int(total_max_time//simulation_timestep)"
]
},
{
"cell_type": "code",
"execution_count": 16,
"execution_count": 4,
"metadata": {},
"outputs": [],
"source": [
"%matplotlib qt\n",
"\n",
"V = Ausgleichsbecken_class(area_base, area_outflux, critical_level_low, critical_level_high,simulation_timestep)\n",
"V = Ausgleichsbecken_class(area_base,area_outflux,critical_level_low,critical_level_high,simulation_timestep)\n",
"# V.set_initial_level(initial_level) \n",
"# V.set_influx(initial_influx)\n",
"# V.set_outflux(initial_outflux)\n",
@@ -119,7 +119,7 @@
},
{
"cell_type": "code",
"execution_count": 17,
"execution_count": 5,
"metadata": {},
"outputs": [],
"source": [
@@ -149,7 +149,7 @@
},
{
"cell_type": "code",
"execution_count": 18,
"execution_count": 6,
"metadata": {},
"outputs": [
{
@@ -158,7 +158,7 @@
"10.1"
]
},
"execution_count": 18,
"execution_count": 6,
"metadata": {},
"output_type": "execute_result"
}