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DEFINE_UDS_UNSTEADY(unsteady_energy_solid,c,t,i,apu,su)
{
real physical_dt, vol, phi_old;
physical_dt = RP_Get_Real("physical-time-step";
vol= C_VOLUME(c,t);
*apu=-vol*rhos*(1-phi)/physical_dt;     /*implicit part*/
phi_old=C_STORAGE_R(c,t,SV_UDSI_M1(i));
*su =vol*rhos*(1-phi)*phi_old/physical_dt;   /*explicit part*/
}
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