gfssp training course tutorials - tfaws 2017...gfssp 4.0 training course tutorial - 1 marshall space...
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GFSSP 4.0 Training CourseTutorial - 1
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GFSSP Training Course Tutorials
11 12 14131112 1213 1314
L=0.1 inD=1.73 in
L=12 inD=1.73 in
L=12 inD=1.73 in
1 10
125 136122
123 124 137 138139
2 3 4 5 6 7 8 912 23 34 45 56 67 78 89 910
A=18.85 in2
each branch
WaterP=50 psiaT=70 F
P=45 psiaT=70 F
T=32 F T=212 F
D=3 inA=3.14159 in2
each branch
A=3.14159 in2
hc=0.022 Btu/ft2-sec-F
Thermal & Fluids Analysis Workshop NASA/Kennedy Space Center & University of Central Florida
August 8-12, 2005
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Tutorial – 1
SIMULATION OF A FLOW SYSTEM CONSISTING OF A PUMP, VALVE AND
PIPE
Flow150 ft
PumpGateValve
Supply Reservoir
Receiving Reservoir
Water
L = 1500 ftD = 6 in.ε/D = 0.005
Pipe
Gravity Vector
θ θ(WRT Gravity Vector) = 95.74°
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GFSSP 4.0 Training CourseTutorial - 3
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PUMPING SYSTEM AND RESERVOIRS SCHEMATIC
Flow150 ft
PumpGateValve
Supply Reservoir
Receiving Reservoir
Water
L = 1500 ftD = 6 in.ε/D = 0.005
Pipe
Gravity Vector
θ θ(WRT Gravity Vector) = 95.74°
Problem Considered:
•Pressure rise across the pump
• Flow rate in the system
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GFSSP 4.0 Training CourseTutorial - 4
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GFSSP MODEL CHARACTERISTICS
1 212 23 3 34
PumpIntercept = 30888Slope = -8.067E-04A = 201.06177 in2
Gate ValveD = 6 in.K1 = 1000K2 = 0.1
L = 18000 in.D = 6 in.ε = 0.03 in.
Pipe
θ(WRT Gravity Vector) = 95.74°
4
Supply ReservoirP = 14.7 psiaT = 60° F
Pump OutletValve Inlet
Valve Outlet Pipe Inlet
Receiving ReservoirP = 14.7 psiaT = 60° F
X
X
XX Branch
Boundary Node
Internal Node
Legend
• Pump as Momentum Source
• Gravity Effects
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GFSSP 4.0 Training CourseTutorial - 5
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VTASC MODEL
VTASC File : tut1.vts
Input data file : tut1.dat
Output data file : tut1.out
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GFSSP 4.0 Training CourseTutorial - 6
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RESULTS
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GFSSP 4.0 Training CourseTutorial - 7
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EXERCISE
• Estimate Pump Horsepower assuming 75% Pump Efficiency
( )
144214sec
191 2
2
2
3
−
hplbfft
ftin
inlbf
ftlbm
lbm
ηρpm ∆
•
Pump Horsepower = = = 228 HP75.05504.62
• Rerun the model with 228 HP and 75% Efficiency
• Check the consistency of results
• Perform a few parametric runs with pump horsepower
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Tutorial – 2
SIMULATION OF COMPRESSIBLE FLOW IN A CONVERGING-DIVERGING NOZZLE
Flow0.492 in.
0.158 in.6.142 in.
1.453 in.
Not to Scale
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GFSSP 4.0 Training CourseTutorial - 9
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CONVERGING-DIVERGING NOZZLE GEOMETRY
Flow0.492 in.
0.158 in.6.142 in.
1.453 in.
Not to Scale
Problem Considered:
• One-dimensional Pressure and Temperature distribution
• Flow rates in subsonic and supersonic flow
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GFSSP 4.0 Training CourseTutorial - 10
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DISCRETIZATION AND BOUNDARY CONDITIONS
R = 0.158in
6.142 in
ThroatInlet Plane Exit Plane
Not to Scale
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1716
0.0395 in. x 4
0.4424 in. x 2
0.0296 in. x 2
0.8848 in. x 5
0.4424 in.
0.1658 in. x 2
0.7265in
0.246 in
Flow
NodeNumber
• Inertia Option
• Second Law Option
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GFSSP 4.0 Training CourseTutorial - 11
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Geometry (CL=0)
MODEL DETAILS
Branch Area (in2) Branch Area (in2)
12 0.3587 910 0.3948 23 0.2717 1011 0.5640 34 0.2243 1112 0.7633 45 0.2083 1213 0.9927 56 0.1901 1314 1.2520 67 0.1949 1415 1.4668 78 0.2255 1516 1.5703 89 0.2875 1617 1.6286
Boundary Condition (Fluid=Water)P1 (psia) T1 ( °F ) P17 (psia) T17 ( °F )
150 1000 134 1000 150 1000 100 1000 150 1000 60 1000 150 1000 30 1000 150 1000 15 1000
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GFSSP 4.0 Training CourseTutorial - 12
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VTASC MODEL
VTASC File : tut2.vts
Input data file : tut2.dat
Output data file : tut2.out
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GFSSP 4.0 Training CourseTutorial - 13
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RESULTS OF PARAMETRIC COMPUTATIONS
Determine the choked flow rate through the nozzle
P1 (psia)
P17 (psia)
&m (lbm/s)
150 134 150 100 150 60 150 50 150 45
Use Restart option to perform parametric runs
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GFSSP 4.0 Training CourseTutorial - 14
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STUDY OF THE RESULTS
• Study results to note the following facts:– Pressure is decreasing from inlet to throat and increases from
throat to exit in subsonic flow (Exit Pressure = 135 psia)– Temperature follows a similar trend; temperature changes due to
expansion and compression– Entropy remains constant due to isentropic assumption– With lower exit pressure (60 psia), flow becomes supersonic in the
diverging part and becomes subsonic with the formation of shock wave
– Flow rate remains constant with exit pressure once choked flow rate is reached
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Tutorial – 5
SIMULATION OF THE BLOW DOWN OF A PRESSURIZED TANK
TankV = 10 ft3
Initial Conditions
pi = 100 psiaTi = 80°F
d = 0.1 in
Atmospherep = 14.7 psia
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GFSSP 4.0 Training CourseTutorial - 16
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NITROGEN TANK SCHEMATIC
TankV = 10 ft3
Initial Conditions
pi = 100 psiaTi = 80°F
d = 0.1 in
Atmospherep = 14.7 psia
Problem Considered:
•Time dependent Pressure, Temperature, and Flow rate history
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GFSSP 4.0 Training CourseTutorial - 17
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DISCRETIZATION AND BOUNDARY CONDITIONS
1 212
Fluid: NitrogenPt=0=100 psiaTt=0=80. °F
V=17280. in3
slbm 0177.0
in 00785.00.1
2
=
=
=
i
L
m
AC
&
Hist2.datP=14.7 psiaT=80. °F
•Unsteady Flow Formulation
•Second Law Option
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ADDITIONAL MODEL DETAILS
Model Run Duration – 200 seconds
Model Time Step – 0.1 seconds
“Hist2.dat” History File Format2 – Number of data pointstau (sec) p(psia) T (ºF) Concentration0 14.700 80.00 1.001000 14.700 80.00 1.00
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GFSSP 4.0 Training CourseTutorial - 19
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VTASC MODEL
VTASC File : tut5.vts
Input data file : tut5.dat
Boundary Node history file : hist2.dat
Output data file : tut5.out
Node & Branch Output Excel files : HISTN.XLS & HISTBR.XLS
Node & Branch Output Winplot files : winpltn.csv & winpltb.csv
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STUDY OF THE RESULTS
• Study tut5.out, HISTN.XLS and HISTBR.XLS to note the following facts:
– Tank Pressure decreases from 100 psia to approximately 38 psia during the model run
– As Tank Pressure drops, Temperature drops as well from 80. °F to approximately –50. °F.
– As the Pressure Difference between the Tank and Atmosphere decreases, Mass Flow Rate decreases
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GFSSP 4.0 Training CourseTutorial - 21
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TANK PRESSURE HISTORY
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GFSSP 4.0 Training CourseTutorial - 22
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TANK TEMPERATURE HISTORY
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GFSSP 4.0 Training CourseTutorial - 23
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MASS FLOW RATE HISTORY
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Tutorial – 7
VALVE-CONTROLLED PRESSURIZATION OF A PROPELLANT TANK
Propellant
Ullage
P
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“BANG-BANG” PRESSURIZATION SYSTEM SCHEMATIC
Problem Considered:
• Control Tank Pressure Within a Specified Tolerance
Propellant
Ullage
P
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GFSSP 4.0 Training CourseTutorial - 26
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DISCRETIZATION AND BOUNDARY CONDITIONS
• Pressurization Option
• Control Valve Branch Option
• Mixture
1
12
2
23
3
4
45
5 56 6
Option 18CL = 0.6A = 0.4418in2
Option 2CL = 0.0 A = 4015 in2
Option 2CL = 0.2 A = 10. in2
Boundary File Name: hist1.datFluid = HeP = 95 psiaT = 120 deg. F
Ullage NodeV=43200. in3
Propellant NodeV=820800. in3
Pseudo Boundary Node
Boundary File Name: hist6.datFluid: O2P=50 psiaT=-300. deg. F
Option 2CL = 0.3 A = 0.4418 in2
Boundary File Name: hist4.datFluid: O2P=74.76 psiaT=-300. deg. F
Fluid: O2P=74.76 psiaT=-300. deg. F
Fluid: HeP=67.0 psiaT=-300. deg. F
Pseudo Branch
Instantaneous Sub-OptionControl Node = 3Initial Position = Open (True)Pressure Tolerance File =cvptol.dat
Boundary Node
Internal Node
BranchFluid: HeP=79.32 psiaT=120. deg. F
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ADDITIONAL MODEL DETAILS
Tank Characteristics Pressure Tolerance File (cvptol.dat)Material: Aluminum
Density: 170. lbm/ft3
Specific Heat: 0.2 Btu/lbm-R
Thermal Conductivity: 0.0362 Btu/ft-s-R
Diameter: 71.5 in.
Wall Thickness: 0.375 in.
Tank Surface Area: 6431.91 in2
Ullage/Propellant Heat Transfer Area: 4015. in2
Ttank: -300. °F
Conv. Heat Transfer Adj. Factor: 1.0
2 0.00 70.00 64.00 1000.00 70.00 64.00
Other CharacteristicsRun Duration: 60 seconds
Time Step: 0.05 seconds
Convergence Criteria: 0.005
RELAXK: 0.5
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GFSSP 4.0 Training CourseTutorial - 28
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VTASC MODEL
VTASC File : tut7.vts
Input data file : tut7.dat
Boundary Node History Files: hist1.dat, hist4.dat, hist6.dat
Pressure Tolerance File: cvptol.dat
Output data file : tut7.out
Output Excel files : HISTN.XLS & HISTBR.XLS
Output Winplot files : winpltn.csv & winpltb.csv
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GFSSP 4.0 Training CourseTutorial - 29
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STUDY OF THE RESULTS
• Study output to note the following facts:– Ullage pressure is maintained between 64 and 70 psia by the
control valve– Difference between ullage pressure and tank bottom pressure due
to gravitational head– Tank bottom pressure decreases as propellant is expelled from the
tank
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Tank Pressure History
60
62
64
66
68
70
72
74
76
78
80
0 10 20 30 40 50 60
Time (sec)
Pres
sure
(psi
a)
Ullage
Tank Bottom
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GFSSP 4.0 Training CourseTutorial - 31
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Tutorial – 9
SIMULATION OF FLUID TRANSIENT FOLLOWING SUDDEN VALVE CLOSURE
400 ft
D = 0.25 inch
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GFSSP 4.0 Training CourseTutorial - 32
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FLUID TRANSIENT SCHEMATIC
400 ft
D = 0.25 inch
Liquid Oxygen at 500 psia and 200 R
Flowrate = 0.1 lb/s
Valve closes in 100 milliseconds
450 psia
Problem Considered:
•Time dependent Pressure and Flow rate history during and after valve closure
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GFSSP 4.0 Training CourseTutorial - 33
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GFSSP MODEL CHARACTERISTICS
1 212 23 3 34 7Liquid OxygenP = 500 psiaT = -260° F
P = 450 psiaT = -260° F4 45 5 56 6 67
PipeL = 960 in.D = 0.25 in.
ValveCL = 0.6A = 0.0491 in2
PipeL = 960 in.D = 0.25 in.
PipeL = 960 in.D = 0.25 in.
PipeL = 960 in.D = 0.25 in.
PipeL = 960 in.D = 0.25 in.
Valve Closure HistoryTime(Sec)
Area(in2)
0.00 0.0491
0.02 0.0164
0.04 0.0055
0.06 0.0018
0.08 0.0006
0.10 0.00
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GFSSP 4.0 Training CourseTutorial - 34
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FLUIDS
VTASC MODEL
VTASC File : tut9.vts
Input data file : tut9.dat
Boundary Node history files : T9hist1.dat & T9hist7.dat
Valve Closure history file: T9hist67.dat
Output data file : tut9.out
Output Excel files : HISTN.XLS, HISTBR.XLS
Output Winplot files : winpltn.csv & winpltb.csv
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ADDITIONAL MODEL DETAILS
• Time step = 0.02 seconds
• Total time = 1 seconds
• Valve Closure•Check Valve Open/Close box on Edit->Options->Unsteady Options page
•Select Advanced->Valve Open/Close dialog to define valve closure history
• Run steady state model first and save data for restart
• Run unsteady case using steady state results as initial condition
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GFSSP 4.0 Training CourseTutorial - 36
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STUDY OF THE RESULTS
• Plot pressure and flowrate history– Peak pressure approximately 620 psia
• Estimate the predicted period of oscillation and compare with the following formula– Period of Oscillation = 4L/a– Where L = length of the pipe – And a = Speed of sound = 2462 ft/sec for LOX
• Plot compressibility history and note variation of compressibility with time
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Tutorial – 12
STEADY STATE CONDUCTION THROUGH A CIRCULAR ROD
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SYSTEM SCHEMATIC
Problem Considered:
•Temperature variation along a circular rod
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GFSSP 4.0 Training CourseTutorial - 39
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GFSSP MODEL CHARACTERISTICS
11 12 14131112 1213 1314
L=0.1 inD=1.73 in
L=12 inD=1.73 in
L=12 inD=1.73 in
1 10
125 136122
123 124 137 138139
2 3 4 5 6 7 8 912 23 34 45 56 67 78 89 910
A=18.85 in2
each branch
WaterP=50 psiaT=70 F
P=45 psiaT=70 F
T=32 F T=212 F
D=3 inA=3.14159 in2
each branch
A=3.14159 in2
hc=0.022 Btu/ft2-sec-F
Solid Node Initial Temperatures=32F
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GFSSP 4.0 Training CourseTutorial - 40
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FLUIDS
VTASC MODEL
VTASC File : tut12.vts
Input data file : tut12.dat
Output data file : tut12.out
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RESULTS
0
50
100
150
200
250
0 3 6 9 12 15 18 21 24
X (inches)
Tem
pera
ture
(Deg
F)
AnalyticalGFSSP