Georg_Brantegger/Python-DT_Slot_3
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corrected steady state pressure to work properly

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Georg ´Brantegger
2022-07-28 11:36:39 +02:00
parent 03ff67e0ad
commit 9df448663e
2 changed files with 52 additions and 47 deletions
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17
Ausgleichsbecken/Ausgleichsbecken_class_file.py
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@@ -9,19 +9,19 @@ parent = os.path.dirname(current)
sys.path.append(parent)
from functions.pressure_conversion import pressure_conversion
def FODE_function(x,h,A,A_a,p,rho,g):
def FODE_function(x_out,h,A,A_a,p,rho,g):
# (FODE ... first order differential equation)
# based on the outflux formula by Andreas Malcherek
# https://www.youtube.com/watch?v=8HO2LwqOhqQ
# adapted for a pressurized pipeline into which the reservoir effuses
# and flow direction
# x ... effusion velocity
# x_out ... effusion velocity
# h ... level in the reservoir
# A_a ... Outflux_Area
# A ... Reservoir_Area
# g ... gravitational acceleration
# rho ... density of the liquid in the reservoir
f = x*abs(x)/h*(A_a/A-1.)+g-p/(rho*h)
f = x_out*abs(x_out)/h*(A_a/A-1.)+g-p/(rho*h)
return f
@@ -101,8 +101,10 @@ class Ausgleichsbecken_class:
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_pressure = self.density*self.g*ss_level-(ss_outflux/self.area_outflux)**2*self.density/2
ss_outflux = ss_influx
ss_influx_vel = ss_influx/self.area
ss_outflux_vel = 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)
self.set_initial_level(ss_level)
@@ -181,7 +183,10 @@ class Ausgleichsbecken_class:
return self.level*self.area
def update_pressure(self):
p_new = self.density*self.g*self.level-(self.outflux/self.area_outflux)**2*self.density/2
influx_vel = self.influx/self.area
outflux_vel = 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):

82
Ausgleichsbecken/Ausgleichsbecken_test_steady_state.ipynb
View File

@@ -2,7 +2,7 @@
"cells": [
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"source": [
@@ -21,7 +21,7 @@
},
{
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"metadata": {},
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"source": [
@@ -31,54 +31,54 @@
"dx = L/n # length of each pipe segment\n",
"dt = dx/c \n",
"\n",
"# define constants\n",
"initial_level = 10.1 # m\n",
"initial_influx = 0.8 # m³/s\n",
"conversion_pressure_unit = 'mWS'\n",
"\n",
"area_base = 75. # m²\n",
"area_outflux = (0.9/2)**2*np.pi # m²\n",
"critical_level_low = 0. # m\n",
"critical_level_high = 10. # m\n",
"simulation_timestep = dt # s\n",
"\n",
"# for while loop\n",
"total_min_level = 0.01 # m\n",
"total_max_time = 1000 # s\n",
"\n",
"nt = int(total_max_time//simulation_timestep)"
]
},
{
"cell_type": "code",
"execution_count": 9,
"metadata": {},
"outputs": [],
"source": [
"# # define constants\n",
"# initial_level = 10.1 # m\n",
"# initial_influx = 5. # m³/s\n",
"# # initial_outflux = 1. # m³/s\n",
"# # initial_pipeline_pressure = 10.\n",
"# # initial_pressure_unit = 'mWS'\n",
"# initial_influx = 0.8 # m³/s\n",
"# conversion_pressure_unit = 'mWS'\n",
"\n",
"# area_base = 1. # m²\n",
"# area_outflux = 0.5 # m²\n",
"# area_base = 75. # m²\n",
"# area_outflux = (0.9/2)**2*np.pi # m²\n",
"# critical_level_low = 0. # m\n",
"# critical_level_high = 10. # m\n",
"# simulation_timestep = 0.0005 # s\n",
"# simulation_timestep = dt # s\n",
"\n",
"# # for while loop\n",
"# total_min_level = 0.01 # m\n",
"# total_max_time = 1000 # s\n",
"# total_max_time = 100 # s\n",
"\n",
"# nt = int(total_max_time//simulation_timestep)"
]
},
{
"cell_type": "code",
"execution_count": 10,
"execution_count": 15,
"metadata": {},
"outputs": [],
"source": [
"# define constants\n",
"initial_level = 10.1 # m\n",
"initial_influx = 1. # m³/s\n",
"# initial_outflux = 1. # m³/s\n",
"# initial_pipeline_pressure = 10.\n",
"# initial_pressure_unit = 'mWS'\n",
"conversion_pressure_unit = 'mWS'\n",
"\n",
"area_base = 75. # m²\n",
"area_outflux = 2. # m²\n",
"critical_level_low = 0. # m\n",
"critical_level_high = 10. # m\n",
"simulation_timestep = dt # s\n",
"\n",
"# for while loop\n",
"total_min_level = 0.01 # m\n",
"total_max_time = 1 # s\n",
"\n",
"nt = int(total_max_time//simulation_timestep)"
]
},
{
"cell_type": "code",
"execution_count": 16,
"metadata": {},
"outputs": [],
"source": [
@@ -119,7 +119,7 @@
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@@ -149,16 +149,16 @@
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"execution_count": 18,
"metadata": {},
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{
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"19.987523898552976"
"10.1"
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@@ -170,7 +170,7 @@
],
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"kernelspec": {
"display_name": "Python 3.8.13 ('Georg_DT_Slot3')",
"display_name": "Python 3.8.13 ('DT_Slot_3')",
"language": "python",
"name": "python3"
},
@@ -189,7 +189,7 @@
"orig_nbformat": 4,
"vscode": {
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