cfd_tests_neumann.py - sphere - GPU-based 3D discrete element method algorithm with optional fluid coupling
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       cfd_tests_neumann.py (2769B)
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            1 #!/usr/bin/env python
            2 from pytestutils import *
            3 
            4 import sphere
            5 import sys
            6 import numpy
            7 
            8 print('### CFD tests - Dirichlet/Neumann BCs ###')
            9 
           10 print('''# Neumann bottom, Dirichlet top BC.
           11 # No gravity, no pressure gradients => no flow''')
           12 '''
           13 orig = sphere.sim("neumann", fluid = True)
           14 cleanup(orig)
           15 orig.defaultParams(mu_s = 0.4, mu_d = 0.4)
           16 orig.defineWorldBoundaries([0.4, 0.4, 1], dx = 0.1)
           17 #orig.initFluid(mu = 8.9e-4)
           18 orig.initFluid(mu = 0.0)
           19 orig.initTemporal(total = 0.05, file_dt = 0.005, dt = 1.0e-4)
           20 py = sphere.sim(sid = orig.sid, fluid = True)
           21 orig.bc_bot[0] = 1      # No-flow BC at bottom (Neumann)
           22 #orig.run(dry=True)
           23 orig.run(verbose=False)
           24 #orig.writeVTKall()
           25 py.readlast(verbose = False)
           26 ones = numpy.ones((orig.num))
           27 py.readlast(verbose = False)
           28 compareNumpyArraysClose(ones, py.p_f, "Conservation of pressure:",
           29         tolerance = 1.0e-5)
           30 
           31 # Fluid flow along z should be very small
           32 if ((numpy.abs(py.v_f[:,:,:,:]) < 1.0e-6).all()):
           33     print("Flow field:\t\t" + passed())
           34 else:
           35     print("Flow field:\t\t" + failed())
           36     print(numpy.min(py.v_f))
           37     print(numpy.mean(py.v_f))
           38     print(numpy.max(py.v_f))
           39     raise Exception("Failed")
           40 '''
           41 
           42 print('''# Neumann bottom, Dirichlet top BC.
           43 # Gravity, pressure gradients => transient flow''')
           44 orig = sphere.sim("neumann", fluid = True)
           45 orig.cleanup()
           46 #orig.defineWorldBoundaries([0.4, 0.4, 1], dx = 0.1)
           47 orig.defineWorldBoundaries([0.3, 0.3, 0.3], dx = 0.1)
           48 #orig.g[2] = -10.0
           49 orig.initFluid(mu = 8.9e-4)
           50 orig.initTemporal(total = 0.05, file_dt = 0.005, dt = 1.0e-4)
           51 #orig.initTemporal(total = 1.0e-2, file_dt = 1.0e-4, dt = 1.0e-4)
           52 #orig.initTemporal(total = 1.0e-3, file_dt = 1.0e-4, dt = 1.0e-4)
           53 #print(orig.largestFluidTimeStep())
           54 #orig.initTemporal(total = orig.largestFluidTimeStep()*10.0,
           55         #file_dt = orig.largestFluidTimeStep(),
           56         #dt = orig.largestFluidTimeStep())
           57 py = sphere.sim(sid = orig.sid, fluid = True)
           58 orig.g[2] = -10.0
           59 orig.bc_bot[0] = 1      # No-flow BC at bottom (Neumann)
           60 #orig.run(dry=True)
           61 orig.run(verbose=False)
           62 #orig.writeVTKall()
           63 py.readlast(verbose = False)
           64 print(py.v_f)
           65 #ideal_grad_p_z = numpy.linspace(
           66 #        orig.p_f[0,0,0] + orig.L[2]*orig.rho_f*numpy.abs(orig.g[2]),
           67 #        orig.p_f[0,0,-1], orig.num[2])
           68 ideal_grad_p_z = numpy.linspace(
           69         orig.p_f[0,0,0] + (orig.L[2]-orig.L[2]/orig.num[2])*orig.rho_f*numpy.abs(orig.g[2]),
           70         orig.p_f[0,0,-1], orig.num[2])
           71 compareNumpyArraysClose(ideal_grad_p_z, py.p_f[0,0,:],
           72         "Pressure gradient:\t", tolerance=1.0e2)
           73 
           74 # Fluid flow along z should be very small
           75 #if ((numpy.abs(py.v_f[:,:,:,2]) < 5.0e-2).all()):
           76 if ((numpy.abs(py.v_f[:,:,:,2]) < 1.0e-4).all()):
           77     print("Flow field:\t\t" + passed())
           78 else:
           79     print("Flow field:\t\t" + failed())
           80     raise Exception("Failed")
           81 
           82 #orig.cleanup()