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b1a417e5a3
New 779-line test file implementing 5-field THM-EC system: - Tests 5-field system: Temperature, Displacement, Pore pressure, Electric potential, Chemical concentration (NEW) - Implements complete physics with 20 off-diagonal coupling blocks - Tests all existing THM-E couplings plus 8 new chemical couplings: K_uc (chemomechanical), K_Tc (reaction heat), K_cT (Soret), K_pc (fluid source), K_cp (pressure-dependent diffusion), K_φc (ionic migration) - Demonstrates chemical transport: diffusion, advection, migration, thermal diffusion, pressure-dependent diffusivity - Tests reaction terms: heat of reaction, fluid source from reactions - Validates complete multi-physics for geothermal, nuclear waste, CO2 sequestration, batteries, concrete durability, corrosion Ultimate demonstration of multi-field Element API with 5 fields and 20 coupling blocks - the most complex multi-physics system possible.