flux_movie.py

# python visit script

# looks for a file named "dumps.visit"
# must be in the current directory 
# 

# Copyright (c) 2019, Alexander D. Kaiser
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
#    list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation
#    and/or other materials provided with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of its
#    contributors may be used to endorse or promote products derived from
#    this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

print 'we out here'

OpenDatabase("dumps.visit")
 
print 'data base open line passed'

# just make sure it's cleaned up 
DeleteAllPlots()


AddPlot("Pseudocolor", "U_z")
SetActivePlots(1)


p = PseudocolorAttributes()
p.min     = -10.0
p.minFlag = 1 
p.max     = 10.0
p.maxFlag = 1
SetPlotOptions(p)




# slice and setup 
AddOperator("Slice")
slice = SliceAttributes()
slice.originType  = 0  # point, required to be an int
slice.originPoint = (0, 0, 3) 
slice.project2d   = 2
slice.normal      = (0, 0, 1)
SetOperatorOptions(slice)

DrawPlots()


# set things to be fairly high resolution 
s = SaveWindowAttributes()
# print 'window attributes: ', s
s.width = 4096
SetSaveWindowAttributes(s)


# get the dimensions 
Query("SpatialExtents", use_actual_data=0)
coords = GetQueryOutputValue()
x_width = coords[1] - coords[0]
y_width = coords[3] - coords[2]

print 'x_width = ', x_width 
print 'y_width = ', y_width 

# x,y domain is [-L, L] total 
len_total = x_width

# make sure things are equal, otherwise need to fix 
assert y_width == len_total
    
area = len_total**2
print 'area = ', area 

 
times    = []
flux     = []
net_flux = []

t          = 0.0
flux_prev  = 0.0 
total_flux = 0.0


for state in range(TimeSliderGetNStates()):
    
    try: 
        if state % (TimeSliderGetNStates()/20) == 0:
            print 'On state ', state, 'of ', TimeSliderGetNStates()
    except: 
        # ignore message if it gives a divide by zero 
        # since there are not enough states 
        pass 
        
    t_prev = t 
    Query('Time')
    t  = GetQueryOutputValue()
    dt = t - t_prev    
    
    SetTimeSliderState(state)
    times.append(t)

    DrawPlots()
    
    # add the z velocity components in the slice 
    Query('Variable Sum')
    
    # add the z velocity components in the slice 
    Query('Average Value')
    
    # Average value gives second order midpoint 
    #     to the current average value
    # Multiply by area to get integral 
    # Add a sign because we want inward flux  
    avg = GetQueryOutputValue()
    flux_current = -area * avg  

    flux.append(flux_current)
    print 'flux = ', flux_current

    # simple trapezoidal rule for net flux 
    total_flux += 0.5 * dt * (flux_current + flux_prev)
    net_flux.append(total_flux)
    
    # variable update for next step 
    flux_prev = flux_current
    
    #if state > 200:
    #     break

    SaveWindow()    


f = open('plot_flux.m', 'w')

f.write('times = ')
f.write( str(times) )
f.write(';\n\n')

f.write('flux = ')
f.write( str(flux) )
f.write(';\n\n')

f.write('net_flux = ')
f.write( str(net_flux) )
f.write(';\n\n')


plot_code = '''
fig = figure; 
plot(times, flux); 
title('flux over time'); 
xlabel('t'); 
ylabel('flux (cm^3 / s)  '); 

fig = figure; 
plot(times, net_flux); 
title('nex flux over time'); 
xlabel('t'); 
ylabel('net flux (cm^3)'); 
'''

f.write(plot_code) 
f.close()

# os.system('ffmpeg -framerate 2 -i visit%04d.png -c:v libx264 -r 30 -pix_fmt yuv420p -vf "scale=4096:trunc(ow/a/2)*2" visit_movie.mp4') 

print 'script cleared without crash'