Interim results

In addition to the "pure flow-relevant data", the temporary concentrations and the density at all nodes are saved in the output file "out.s" and in the background files as intermediate results of the density-dependent transient mass transport calculation.

Final results

At the end of the density-dependent transient mass transport, the calculation provides not only the pure flow-relevant data but also the final concentrations and the associated density at all nodes.

If the result concentrations are required as starting values for a subsequent calculation, the result concentration must be converted from the unit kg/m³ back to kg/kg for the initial concentrations (AKON). This can be done in SPRING in three simple steps:

• Firstly, the calculated concentrations are imported via Attributes Import model data/ result data to any identifier, e.g. CCCC.

• The associated density is then also imported via Attributes Import model data/result data to any identifier, e.g. RRRR.

• In the last step, the new AKON is calculated via Attributes Compute Calculator: Concentrations CCCC / Density RRRR = AKON (kg/kg)

Batch file of density-dependent flow