# PorousFlowBasicTHM System

## Available Actions

- Porous Flow App
- PorousFlowBasicTHMAdds Kernels and fluid-property Materials necessary to simulate a single-phase, single-component fully-saturated flow problem. No upwinding and no mass lumping of the fluid mass are used. The fluid-mass time derivative is close to linear, and is perfectly linear if multiply_by_density=false. These features mean the results may differ slightly from the Unsaturated Action case. To run a simulation you will also need to provide various other Materials for each mesh block, depending on your simulation type, viz: permeability, constant Biot modulus, constant thermal expansion coefficient, porosity, elasticity tensor, strain calculator, stress calculator, matrix internal energy, thermal conductivity, diffusivity