OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › Poiseuille2D: Interpolated and local values(velocity and pressure) › Reply To: Poiseuille2D: Interpolated and local values(velocity and pressure) August 6, 2021 at 5:02 pm #5896 mathiasKeymaster You may navigate within the code easily using doxygen. In LBM, you set the pressure by setting rho — the transformation formular is the equation of state.