def end_conv_steady_cond(plotting=False):
print('Testing steady conduction with convection on ends...')
# Supply file name
file_name = os.getcwd() + '/Inputs/simple_conv.yaml'
# Run model
model = main_fv.lim1tr_model(file_name)
eqn_sys, cond_man, mat_man, grid_man, bc_man, reac_man, data_man, time_opts = model.run_model(
)
# Analytical soln
T_left = model.parser.cap_dict['Boundary']['Left']['T']
T_right = model.parser.cap_dict['Boundary']['Right']['T']
r_tot = (2. / 100.) + np.sum(grid_man.dx_arr) / mat_man.k_arr[0]
q_flux = (T_left - T_right) / r_tot
T_o = T_left - q_flux / 100.
T_l = T_right + q_flux / 100.
T_ans = T_o - (q_flux / mat_man.k_arr[0]) * grid_man.x_node
err = np.sum((T_ans - eqn_sys.T_lin)**2) / grid_man.n_tot
if plotting:
quick_plot(grid_man.x_node, T_ans, eqn_sys.T_lin, err,
'end_conv_steady_cond')
if err > 1e-16:
print('\tFailed with MSE {:0.2e}\n'.format(err))
return 0
else:
print('\tPassed\n')
return 1
def end_conv_steady_cond_stack(plotting=False):
print('Testing steady conduction through a stack of three materials...')
# Supply file name
file_name = os.getcwd() + '/Inputs/stack_cond.yaml'
# Run model
model = main_fv.lim1tr_model(file_name)
eqn_sys, cond_man, mat_man, grid_man, bc_man, reac_man, data_man, time_opts = model.run_model(
)
# Analytical soln
h_left = model.parser.cap_dict['Boundary']['Left']['h']
T_left = model.parser.cap_dict['Boundary']['Left']['T']
T_right = model.parser.cap_dict['Boundary']['Right']['T']
r_tot = 2 * (0.1 / 10.) + 0.1 / 2. + 2. / 10000.
q_flux = (T_left - T_right) / r_tot
T_b = np.zeros(4)
T_b[0] = T_left - q_flux / h_left
T_b[1] = T_b[0] - q_flux * 0.1 / 10.
T_b[2] = T_b[1] - q_flux * 0.1 / 2.
T_b[3] = T_b[2] - q_flux * 0.1 / 10.
x_b = np.array([0, 0.1, 0.2, 0.3])
T_ans = np.interp(grid_man.x_node, x_b, T_b)
err = np.sum((T_ans - eqn_sys.T_lin)**2) / grid_man.n_tot
if plotting:
quick_plot(grid_man.x_node, T_ans, eqn_sys.T_lin, err,
'end_conv_steady_cond_stack')
if err > 1e-16:
print('\tFailed with MSE {:0.2e}\n'.format(err))
return 0
else:
print('\tPassed\n')
return 1
def deactivate_bcs_test():
# Build model
file_name = os.getcwd() + '/Inputs/small_cube.yaml'
model = main_fv.lim1tr_model(file_name)
# Set steady flux on all BCs
flux_bnd = {'Type': 'Heat Flux', 'Flux': 10000., 'Deactivation Time': 5}
bnd_dict = {
'External': {
'Type': 'Adiabatic'
},
'Left': flux_bnd,
'Right': flux_bnd
}
model.parser.cap_dict['Boundary'] = bnd_dict
eqn_sys, cond_man, mat_man, grid_man, bc_man, reac_man, data_man, time_opts = model.run_model(
)
dT_rate = 2 * 10000 / (0.01 * 2000 * 500)
T_true = 300 + dT_rate * 5
err = abs(T_true - eqn_sys.T_lin[0])
if err > 1e-13:
print('\tFailed with RMSE {:0.2e}\n'.format(err))
return 0
else:
print('\tPassed\n')
return 1
def simple_steady_cond_one_block(plotting=False):
print('Testing steady dirichlet conduction...')
# Supply file name
file_name = '{}/Inputs/simple_cond.yaml'.format(os.getcwd())
model = main_fv.lim1tr_model(file_name)
test_status = simple_steady_cond_base(model,
'simple_steady_cond_one_block',
plotting=plotting)
return test_status
def contact_resistance(plotting=False):
print(
'Testing steady conduction with through a stack of three materials with contact resistances...'
)
# Supply file name
file_name = os.getcwd() + '/Inputs/stack_contact.yaml'
# Run model
model = main_fv.lim1tr_model(file_name)
eqn_sys, cond_man, mat_man, grid_man, bc_man, reac_man, data_man, time_opts = model.run_model(
)
h_left = model.parser.cap_dict['Boundary']['Left']['h']
h_right = model.parser.cap_dict['Boundary']['Right']['h']
T_left = model.parser.cap_dict['Boundary']['Left']['T']
T_right = model.parser.cap_dict['Boundary']['Right']['T']
# Analytical soln
R_1 = 1. / 100.
R_2 = 2. / 100.
mat_nodes = int(grid_man.x_node.shape[0] / 3.)
r_tot = 2 * (0.1 / 10.) + 0.1 / 2. + 1. / h_left + 1. / h_right + R_1 + R_2
q_flux = (T_left - T_right) / r_tot
T_1 = T_left - q_flux / h_left
T_2 = T_1 - q_flux * 0.1 / 10.
T_3 = T_2 - q_flux * R_1
T_4 = T_3 - q_flux * 0.1 / 2.
T_5 = T_4 - q_flux * R_2
T_6 = T_5 - q_flux * 0.1 / 10.
T_ans = np.zeros(grid_man.x_node.shape[0])
T_ans[:mat_nodes] = grid_man.x_node[:mat_nodes] * (T_2 - T_1) / 0.1 + T_1
T_ans[mat_nodes:2 *
mat_nodes] = (grid_man.x_node[mat_nodes:2 * mat_nodes] -
0.1) * (T_4 - T_3) / 0.1 + T_3
T_ans[2 * mat_nodes:] = (grid_man.x_node[2 * mat_nodes:] -
0.2) * (T_6 - T_5) / 0.1 + T_5
err = np.sum((T_ans - eqn_sys.T_lin)**2) / grid_man.n_tot
if plotting:
quick_plot(grid_man.x_node,
T_ans,
eqn_sys.T_lin,
err,
'end_conv_steady_contact_stack',
raw_diff=False)
if err > 1e-1:
print('\tFailed with MSE {:0.2e}\n'.format(err))
return 0
else:
print('\tPassed\n')
return 1
def trans_end_conv(file_name, plotting=False):
# Run model
model = main_fv.lim1tr_model(file_name)
eqn_sys, cond_man, mat_man, grid_man, bc_man, reac_man, data_man, time_opts = model.run_model(
)
# Fourier number
L = np.sum(grid_man.dx_arr) * 0.5
my_t = time_opts['Run Time']
my_mat = mat_man.get_material('A')
alpha = my_mat.k / (my_mat.rho * my_mat.cp)
Fo = alpha * my_t / L**2
# Analytical soln (Incropera 6th edition, p. 273)
zeta_n = [1.3138, 4.0336, 6.9096,
9.8928] # First four roots of the transcendental eqn with Bi = 5
half_nodes = int(grid_man.n_tot * 0.5)
x_star = (np.arange(half_nodes) + 0.5) / half_nodes
T_right = model.parser.cap_dict['Boundary']['Right']['T']
theta = np.zeros(half_nodes)
for i in range(4):
C_n = 4. * np.sin(
zeta_n[i]) / (2. * zeta_n[i] + np.sin(2. * zeta_n[i]))
theta += C_n * np.exp(-zeta_n[i]**2 * Fo) * np.cos(zeta_n[i] * x_star)
T_ans = T_right + theta * (np.mean(time_opts['T Initial']) - T_right)
# Calculate error
err = np.sqrt(np.sum((T_ans - eqn_sys.T_lin[half_nodes:])**2) / half_nodes)
if plotting:
is_split = ''
if 'split' in file_name:
is_split = '_split'
plt.figure()
plt.plot(L * (1. + x_star), T_ans, 'o', label='Analytical')
plt.plot(grid_man.x_node, eqn_sys.T_lin, '-', label='Numerical')
plt.ylim([370, 470])
plt.xlabel(r'Postion ($m$)')
plt.ylabel(r'Temperature ($K$)')
plt.legend()
plt.title('RMSE = {:.2E}'.format(err))
plt.savefig('./Figures/trans_end_conv_order_{}{}.png'.format(
time_opts['Order'], is_split),
bbox_inches='tight')
plt.close()
if err > 2e-2:
print('\tFailed with RMSE {:0.2e}\n'.format(err))
return 0
else:
print('\tPassed\n')
return 1
def simple_steady_cond_two_blocks_right_cv(plotting=False):
print('Testing steady dirichlet conduction...')
# Supply file name
file_name = '{}/Inputs/simple_cond.yaml'.format(os.getcwd())
model = main_fv.lim1tr_model(file_name)
model.parser.cap_dict['Domain Table'] = {
'Material Name': ['A', 'A'],
'Thickness': [0.099, 0.001],
'dx': [0.001, 0.001]
}
test_status = simple_steady_cond_base(
model, 'simple_steady_cond_two_blocks_right_cv', plotting=plotting)
return test_status
def trans_end_flux_cn(plotting=False):
print('Testing second-order transient end flux...')
# Run model
file_name = os.getcwd() + '/Inputs/trans_end_flux_cn.yaml'
model = main_fv.lim1tr_model(file_name)
eqn_sys, cond_man, mat_man, grid_man, bc_man, reac_man, data_man, time_opts = model.run_model(
)
# Save a few numbers
L = np.sum(grid_man.dx_arr) * 0.5
my_t = time_opts['Run Time']
my_mat = mat_man.get_material('A')
alpha = my_mat.k / (my_mat.rho * my_mat.cp)
q_in = model.parser.cap_dict['Boundary']['Left']['Flux']
# Analytical soln (Incropera 6th edition, p. 286)
c_one = (2 * q_in / my_mat.k) * np.sqrt(alpha * my_t / np.pi)
c_two = np.exp(-1. * grid_man.x_node**2 / (4 * alpha * my_t))
c_three = q_in * grid_man.x_node / my_mat.k
c_four = sp.special.erfc(grid_man.x_node * 0.5 / np.sqrt(alpha * my_t))
T_ans = np.mean(time_opts['T Initial']) + c_one * c_two - c_three * c_four
# Calculate error
err = np.sqrt(np.sum((T_ans - eqn_sys.T_lin)**2) / grid_man.n_tot)
if plotting:
is_split = ''
if 'split' in file_name:
is_split = '_split'
plt.figure()
plt.plot(grid_man.x_node, T_ans, 'o', label='Analytical')
plt.plot(grid_man.x_node, eqn_sys.T_lin, '-', label='Numerical')
plt.xlabel(r'Postion ($m$)')
plt.ylabel(r'Temperature ($K$)')
plt.legend()
plt.title('RMSE = {:.2E}'.format(err))
plt.savefig('./Figures/trans_end_flux_cn.png', bbox_inches='tight')
plt.close()
if err > 2e-4:
print('\tFailed with RMSE {:0.2e}\n'.format(err))
return 0
else:
print('\tPassed\n')
return 1
def trans_ext_conv(file_name, e_tol):
# Run model
model = main_fv.lim1tr_model(file_name)
eqn_sys, cond_man, mat_man, grid_man, bc_man, reac_man, data_man, time_opts = model.run_model(
)
my_t = time_opts['Run Time']
my_mat = mat_man.get_material('A')
h_ext = model.parser.cap_dict['Boundary']['External']['h']
T_ext = model.parser.cap_dict['Boundary']['External']['T']
C_o = h_ext * bc_man.PA_r / (my_mat.rho * my_mat.cp)
T_ans = T_ext + (np.mean(time_opts['T Initial']) - T_ext) * np.exp(
-1.0 * C_o * my_t)
err = np.max(np.abs(eqn_sys.T_lin - T_ans))
if err > e_tol:
print('\tFailed with RMSE {:0.2e}\n'.format(err))
return 0
else:
print('\tPassed\n')
return 1
def exterior_steady_cond(plotting=False):
print(
'Testing steady dirichlet conduction with a convection source at each node...'
)
# Supply file name
file_name = os.getcwd() + '/Inputs/simple_fin.yaml'
# Run model
model = main_fv.lim1tr_model(file_name)
eqn_sys, cond_man, mat_man, grid_man, bc_man, reac_man, data_man, time_opts = model.run_model(
)
h_left = model.parser.cap_dict['Boundary']['Left']['h']
T_left = model.parser.cap_dict['Boundary']['Left']['T']
h_ext = model.parser.cap_dict['Boundary']['External']['h']
T_ext = model.parser.cap_dict['Boundary']['External']['T']
# Analytical soln (Incropera 6th edition, p. 144)
dy = 0.2
dz = 0.1
P = 2 * (dy + dz)
A_c = dy * dz
L_x = np.sum(grid_man.dx_arr)
C_m = np.sqrt(h_ext * bc_man.PA_r / mat_man.k_arr[0])
s_grid = grid_man.x_node
C_1 = 1. / ((1. + np.exp(C_m * L_x)) - (mat_man.k_arr[0] * C_m / h_left) *
(1. - np.exp(C_m * L_x)))
T_ans = T_ext + (T_left - T_ext) * C_1 * (np.exp(C_m * s_grid) +
np.exp(C_m * (L_x - s_grid)))
err = np.sum((T_ans - eqn_sys.T_lin)**2) / grid_man.n_tot
if plotting:
quick_plot(grid_man.x_node, T_ans, eqn_sys.T_lin, err,
'exterior_steady_cond')
if err > 2e-5:
print('\tFailed with MSE {:0.2e}\n'.format(err))
return 0
else:
print('\tPassed\n')
return 1
def short_rxn_CoO2():
'''Check the short reaction evaluation at a given state for CoO2 limiting
'''
print('Testing short circuit reaction with CoO2 limiting...')
# Run Model
model = main_fv.lim1tr_model('./Inputs/short_only.yaml')
model.parser.cap_dict['Species']['Initial Mass Fraction'][0] = 0.16
model.parser.cap_dict['Species']['Initial Mass Fraction'][1] = 0.13
eqn_sys, cond_man, mat_man, grid_man, bc_man, reac_man, data_man, time_opts = model.run_model()
# Compute solution
voltage = 4.2
short_resistance = 0.001
volume = 4.8e-5
charge_kmol = 1000*6.022e23*1.6023e-19
kg_reactants = 79.007 + 90.931
Y_o = model.parser.cap_dict['Species']['Initial Mass Fraction']
rho_CoO2_o = 2000*Y_o[1]
t_arr = np.linspace(0, 4, 41)
dT_dt = voltage**2/(short_resistance*volume*2000*800)
rate = voltage*kg_reactants/(short_resistance*charge_kmol*volume)
rho_CoO2 = rho_CoO2_o - rate*t_arr*(90.931/(79.007 + 90.931))
T_ans = 298.15 + dT_dt*t_arr
t_complete = rho_CoO2_o/(rate*90.931/(79.007 + 90.931))
T_f = 298.15 + dT_dt*t_complete
for i in range(t_arr.shape[0]):
if rho_CoO2[i] < 0:
rho_CoO2[i] = 0
T_ans[i] = T_f
err = np.sqrt(np.mean((rho_CoO2 - data_man.data_dict['CoO2'][:,0])**2))
err += np.sqrt(np.mean((T_ans - data_man.data_dict['Temperature'][:,0])**2))
if err > 1e-7:
print('\tFailed with RMSE {:0.2e}\n'.format(err))
return 0
else:
print('\tPassed\n')
return 1
def left_conv_right_flux(plotting=False):
print(
'Testing steady conduction with through a stack of three materials with contact resistances...'
)
# Supply file name
file_name = os.getcwd() + '/Inputs/left_conv_right_flux.yaml'
# Run model
model = main_fv.lim1tr_model(file_name)
eqn_sys, cond_man, mat_man, grid_man, bc_man, reac_man, data_man, time_opts = model.run_model(
)
h_left = model.parser.cap_dict['Boundary']['Left']['h']
T_left = model.parser.cap_dict['Boundary']['Left']['T']
flux_right = model.parser.cap_dict['Boundary']['Right']['Flux']
# Analytical soln
L_x = np.sum(grid_man.dx_arr)
T_l = T_left + flux_right / h_left
T_r = T_l + flux_right * L_x / mat_man.k_arr[0]
T_ans = T_l + grid_man.x_node * (T_r - T_l) / L_x
err = np.sum((T_ans - eqn_sys.T_lin)**2) / grid_man.n_tot
if plotting:
quick_plot(grid_man.x_node,
T_ans,
eqn_sys.T_lin,
err,
'left_conv_right_flux',
raw_diff=False)
if err > 1e-12:
print('\tFailed with MSE {:0.2e}\n'.format(err))
return 0
else:
print('\tPassed\n')
return 1
