source: trunk/anuga_core/source/anuga/structures/boyd_box_operator_Amended3.py @ 8125

Last change on this file since 8125 was 8125, checked in by wilsonr, 13 years ago

Changes to address ticket 360.
File size: 11.0 KB
Line 
1import anuga
2import math
3
4class Boyd_box_operator(anuga.Structure_operator):
5    """Culvert flow - transfer water from one rectangular box to another.
6    Sets up the geometry of problem
7   
8    This is the base class for culverts. Inherit from this class (and overwrite
9    compute_discharge method for specific subclasses)
10   
11    Input: Two points, pipe_size (either diameter or width, height),
12    mannings_rougness,
13    """
14
15
16    def __init__(self,
17                 domain,
18                 end_point0, 
19                 end_point1,
20                 losses,
21                 width,
22                 height=None,
23                 apron=None,
24                 manning=0.013,
25                 enquiry_gap=0.2,
26                 use_momentum_jet=True,
27                 use_velocity_head=True,
28                 description=None,
29                 label=None,
30                 structure_type='boyd_box',
31                 logging=False,
32                 verbose=False):
33
34                     
35        anuga.Structure_operator.__init__(self,
36                                          domain,
37                                          end_point0, 
38                                          end_point1,
39                                          width,
40                                          height,
41                                          apron,
42                                          manning,
43                                          enquiry_gap,                                                       
44                                          description,
45                                          label,
46                                          structure_type,
47                                          logging,
48                                          verbose)     
49       
50       
51        if isinstance(losses, dict):
52            self.sum_loss = sum(losses.values())
53        elif isinstance(losses, list):
54            self.sum_loss = sum(losses)
55        else:
56            self.sum_loss = losses
57       
58        self.use_momentum_jet = use_momentum_jet
59        self.use_velocity_head = use_velocity_head
60       
61        self.culvert_length = self.get_culvert_length()
62        self.culvert_width = self.get_culvert_width()
63        self.culvert_height = self.get_culvert_height()
64
65        self.max_velocity = 10.0
66
67        self.inlets = self.get_inlets()
68
69
70        # Stats
71       
72        self.discharge = 0.0
73        self.velocity = 0.0
74       
75        self.case = 'N/A'
76
77   
78    def discharge_routine(self):
79
80        local_debug ='false'
81       
82        if self.inflow.get_enquiry_height() > 0.01: #this value was 0.01:  We should call this Enquiry Depth
83            if local_debug =='true':
84                anuga.log.critical('Specific E & Deltat Tot E = %s, %s'
85                             % (str(self.inflow.get_enquiry_specific_energy()),
86                                str(self.delta_total_energy)))
87                anuga.log.critical('culvert type = %s' % str(culvert_type))
88            # Water has risen above inlet
89
90
91
92            msg = 'Specific energy at inlet is negative'
93            assert self.inflow.get_enquiry_specific_energy() >= 0.0, msg
94
95            if self.use_velocity_head :
96                self.driving_energy = self.inflow.get_enquiry_specific_energy()
97            else:
98                self.driving_energy = self.inflow.get_enquiry_height()
99
100            height = self.culvert_height
101            width = self.culvert_width
102            flow_width = self.culvert_width
103           
104            # intially assume the culvert flow is controlled by the inlet
105            # check unsubmerged and submerged condition and use Min Q
106            # but ensure the correct flow area and wetted perimeter are used
107            if self.driving_energy < height:
108                # Inlet Unsubmerged
109                self.case = 'Inlet unsubmerged Box Acts as Weir'
110                Q_inlet = 0.544*anuga.g**0.5*width*self.driving_energy**1.50 # Flow based on Inlet Ctrl Inlet Unsubmerged
111                V_inlet = Q_inlet/(width*self.driving_energy)
112            elif (self.driving_energy > height) and (self.driving_energy < 1.93*height):
113                # Inlet in Transition Zone by Boyd  New equation
114                self.case = 'Inlet in Transition between Weir & Orifice'
115                Q_inlet = 0.54286*anuga.g**0.5*width*height**0.5*self.driving_energy
116                dcrit = (Q_inlet**2/anuga.g/width**2)**0.333333 # Based on Inlet Control
117                if dcrit < height:
118                    V_inlet = Q_inlet/(width*dcrit) # Full Box Velocity
119                else:
120                    V_inlet = Q_inlet/(width*height) # Full Box Velocity
121               
122            else:
123                # Inlet Submerged
124                self.case = 'Inlet Submerged Box Acts as Orifice'
125                Q_inlet = 0.702*anuga.g**0.5*width*height**0.89*self.driving_energy**0.61  # Flow based on Inlet Ctrl Inlet Submerged
126                V_inlet = Q_inlet/(width*height) # Full Box Velocity
127           
128            Q = Q_inlet
129            dcrit = (Q**2/anuga.g/width**2)**0.333333 # Based on Inlet Control
130            #
131            # May not need this .... check if same is done above  Might move this block Yet ???
132            outlet_culvert_depth = dcrit
133           
134            if outlet_culvert_depth > height:
135                outlet_culvert_depth = height  # Once again the pipe is flowing full not partfull
136                flow_area = width*height  # Cross sectional area of flow in the culvert
137                perimeter = 2*(width+height)
138                self.case = 'Inlet CTRL Outlet unsubmerged PIPE PART FULL'
139            else:
140                flow_area = width * outlet_culvert_depth
141                perimeter = width+2*outlet_culvert_depth
142                self.case = 'INLET CTRL Culvert is open channel flow we will for now assume critical depth'
143            # Initial Estimate of Flow for Outlet Control using energy slope
144            #( may need to include Culvert Bed Slope Comparison)
145            hyd_rad = flow_area/perimeter
146           
147           
148            # NEED TO DETERMINE INTERNAL BARREL VELOCITY  Could you Direct Step Method or Standard Step to compute Profile & Friction loss more accurately
149            # For Now Assume Normal Depth in the Pipe if Part full
150            #culvert_velocity = math.sqrt(self.delta_total_energy/((self.sum_loss/2/anuga.g)+(self.manning**2*self.culvert_length)/hyd_rad**1.33333))
151            # Calculate Culvert velocity Based on the greater of the Pipe Slope, or the Slope of the Energy Line
152            if pipe_slope > energy_line_slope:
153                slope = pipe_slope
154            else:
155                slope = energy_line_slope
156           
157            # Here need to iterate Depth or use Table
158            while Qpartfull < Q:
159                for i in numpy.arange(0.01, self.get_culvert_height(), 0.01):
160                    partfull_Area= partfull_depth*width
161                    partfull_Perimeter= width+2*partfull_depth
162                    partfull_Hyd_Rad = partfull_Area/Partfull_Perimeter
163                    Vpartfull = Partfull_Hyd_Rad**(2/3)*slope**0.5/self.manning
164                    Qpartfull = Vpartfull*partfull_Area
165                    if partfull_depth < dcrit:
166                        flow_type = 'Super-critical in Barrel'
167                    elif partfull_depth > dcrit:
168                        flow_type = 'Sub-critical in Barrel'
169                    else: #partfull = dcrit
170                        flow_type = 'Critical Depth in Barrel'
171           
172            #culvert_velocity = math.sqrt(self.delta_total_energy/((self.manning**2*self.culvert_length)/hyd_rad**1.33333)) # Based only on Friction Loss
173            #Q_outlet_tailwater = flow_area * culvert_velocity
174           
175           
176            if self.delta_total_energy < self.driving_energy:  # wE SHOULD DO THIS ANYWAY NOT ONLY FOR THIS CONDITION OTHER WISE MIGHT MISS oUTLET CONTROL SOMETIMES
177                # Calculate flows for outlet control
178
179                # Determine the depth at the outlet relative to the depth of flow in the Culvert
180                if self.outflow.get_enquiry_height() > height:        # The Outlet is Submerged
181                    outlet_culvert_depth=height
182                    flow_area=width*height       # Cross sectional area of flow in the culvert
183                    perimeter=2.0*(width+height)
184                    self.case = 'Outlet submerged Culvert Flowing Full'
185                else:   # Here really should use the Culvert Slope to calculate Actual Culvert Depth & Velocity
186                    dcrit = (Q**2/anuga.g/width**2)**0.333333
187                    outlet_culvert_depth=dcrit   # For purpose of calculation assume the outlet depth = Critical Depth
188                    if outlet_culvert_depth > height:
189                        outlet_culvert_depth=height
190                        flow_area=width*height
191                        perimeter=2.0*(width+height)
192                        self.case = 'Outlet is Flowing Full'
193                    else:
194                        flow_area=width*outlet_culvert_depth
195                        perimeter=(width+2.0*outlet_culvert_depth)
196                        self.case = 'Outlet is open channel flow'
197
198                hyd_rad = flow_area/perimeter
199
200
201
202                # Rename this next one  V_outlet
203                culvert_velocity = math.sqrt(self.delta_total_energy/((self.sum_loss/2/anuga.g)+(self.manning**2*self.culvert_length)/hyd_rad**1.33333))
204                Q_outlet_tailwater = flow_area * culvert_velocity
205               
206                 # Final Outlet control velocity using tail water
207                # Determine HEad Loss based on Inlet, Barrel and Outlet Velocities
208               
209
210                #FIXME SR: Is this code used?
211                Inlet_Loss = Vinlet**2/(2*g)* Inlet_Loss_Coeff
212                Barrel_Loss = self.culvert.length*Vpartfull**2/(partfull_Hyd_Rad**(4/3))
213                Bend_Loss = Vpartfull**2/(2*g)* Bend_Loss_Coeff
214                #Other_Loss ???
215                Exit_Loss = culvert_velocity**2/(2*g)*Exit_Loss_Coeff
216                Total_Loss = Inlet_Loss+Barrel_Loss+Bend_Loss+Exit_Loss
217
218 
219                Q = min(Q, Q_outlet_tailwater)
220            else:
221                pass
222                #FIXME(Ole): What about inlet control?
223
224            culv_froude=math.sqrt(Q**2*flow_width/(anuga.g*flow_area**3))
225            if local_debug =='true':
226                anuga.log.critical('FLOW AREA = %s' % str(flow_area))
227                anuga.log.critical('PERIMETER = %s' % str(perimeter))
228                anuga.log.critical('Q final = %s' % str(Q))
229                anuga.log.critical('FROUDE = %s' % str(culv_froude))
230
231            # Determine momentum at the outlet
232            barrel_velocity = Q/(flow_area + anuga.velocity_protection/flow_area)
233
234        # END CODE BLOCK for DEPTH  > Required depth for CULVERT Flow
235
236        else: # self.inflow.get_enquiry_height() < 0.01:
237            Q = barrel_velocity = outlet_culvert_depth = 0.0
238
239        # Temporary flow limit
240        if barrel_velocity > self.max_velocity:
241            barrel_velocity = self.max_velocity
242            Q = flow_area * barrel_velocity
243
244        return Q, barrel_velocity, outlet_culvert_depth
245       
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