def set_state(self, pressure, temperature):
""" Update the material to the given pressure [Pa] and temperature.
This updates the other properties of this class (v_s, v_p, ...).
"""
#in an effort to avoid additional work, don't do all the calculations if nothing has changed
try:
if self.pressure == pressure and self.temperature == temperature and self.old_params == self.params:
return
except AttributeError:
pass #do nothing
self.pressure = pressure
self.temperature = temperature
self.old_params = self.params
if (self.method == bm):
self.V = self.method.volume(self.pressure, self.params)
self.K_T = self.method.bulk_modulus(self.V, self.params)
self.K_S = self.K_T # since you are ignoring temperature in this method
if (self.params.has_key('ref_mu') and self.params.has_key('mu_prime')):
self.mu = self.method.shear_modulus(self.V, self.params)
else:
self.mu = -1
warnings.warn(('Warning: mu and or mu_prime are undefined for ' + self.to_string()))
else:
self.V = self.method.volume(self.pressure, self.temperature, self.params)
self.K_T = self.method.bulk_modulus(self.temperature, self.V, self.params)
self.K_S = self.method.bulk_modulus_adiabatic(self.temperature, self.V, self.params)
self.C_v = self.method.heat_capacity_v(self.temperature,self.V, self.params)
self.C_p = self.method.heat_capacity_p(self.temperature,self.V, self.params)
self.alpha = self.method.thermal_expansivity(self.temperature, self.V, self.params)
self.gr = mgd.grueneisen_parameter(self.params['ref_V']/self.V, self.params)
if (self.params.has_key('ref_mu') and self.params.has_key('mu_prime')):
self.mu = self.method.shear_modulus(self.temperature, self.V, self.params)
else:
self.mu = -1
warnings.warn(('Warning: mu and or mu_prime are undefined for ' + self.to_string()))
def thermal_expansivity(T,V,params):
C_v = heat_capacity_v(T,V,params)
gr = mgd.grueneisen_parameter(params['ref_V']/V, params)
K = bulk_modulus(T,V,params)
alpha = gr * C_v / K / V
return alpha
def bulk_modulus_adiabatic(T,V,params):
K_T=bulk_modulus(T,V,params)
alpha = thermal_expansivity(T,V,params)
gr = mgd.grueneisen_parameter(params['ref_V']/V, params)
K_S = K_T*(1. + gr * alpha * T)
return K_S
def heat_capacity_p(T,V,params):
alpha = thermal_expansivity(T,V,params)
gr = mgd.grueneisen_parameter(params['ref_V']/V, params)
C_v = heat_capacity_v(T,V,params)
C_p = C_v*(1. + gr * alpha * T)
return C_p