Check & run

The last page of the input workflow checks the project, shows an overview and runs the calculation (F5 or ▶ Run do the same from any page).

Checks

The project is checked before every run; problems are listed in red and the calculation does not start until they are solved. Checked are, among others:

• the profile: at least 3 and at most 1001 nodes, depths increasing from top to bottom, every node refers to a defined material;
• the materials: θs > θr, α > 0 and n > 1 (except Brooks–Corey and Kosugi), Ks > 0;
• the time: final time > initial time, Δt > 0, dtMin > 0, dtMax ≥ dtMin;
• time-variable boundary conditions need at least one record;
• meteorological data: records present, measurement heights above the zero-plane displacement, cloudiness parameters set;
• solute and heat parameters for all materials;
• the hysteresis state matches the number of nodes;
• the further options (τw ≥ 0, centrifuge speed > 0, positive density and viscosity ratios; not with dual permeability);
• an inverse problem needs inverse settings.

After writing a HYDRUS-1D project, the page also lists the settings that HYDRUS-1D cannot store.

Overview

Title, units, number of nodes, depth, materials and observation nodes, the hydraulic model, the simulated period and the processes.

Running

▶ Run calculation starts the simulation in the background; the status bar shows the progress. ■ Stop (menu bar or Calculation → Stop) ends it and keeps the results computed so far. When the run has finished, the page Profiles opens. With an inverse problem, Run starts the parameter estimation.

If a run stops because the iteration does not converge, see questions and problems.