In the previous steps, it was ensured that the boundary nodes of the partial model correspond geometrically with the inner boundary nodes of the overall model. Now, the attribution of the boundary nodes of the partial model is examined in view of the effect in the combined model.

 

To the boundary nodes of the partial model is the in- and outflow assigned which was determined in the overall model. This boundary condition has to be removed from the partial model. Otherwise nonexistent in-or outflows are simulated.

For the partial model has to be checked, whether line data extend beyond the boundary, too.

Further is to examine whether the same attributes are defined on the corresponding nodes in the partial- and in the overall model. For data types that can be present on a node only once, this step is of minor importance, since in this case the value of the imported mesh overwrites the existing value of the opened mesh.

For attributes that are allowed several times on a node (eg, line-related leakage coefficient), the corresponding attribute is to be removed in one of the two meshes. Otherwise, for example, has a receiving water course, which runs on the model boundary, after the integration of the partial model, a double-leakage effect. This needs to be avoided in any case.

The user should have an overview of the existing attributes on the coincident boundaries to recognize present contradictions and to clarify the cause before certain data on the total mesh is definitively lost.

 

If the nodes of the coincident boundaries are adjusted in both models, both in relation to the geometrical location and on the attribution, the models are combined with SPRING.

The following strategy is advantageous:

First, the mesh of the overall model is opened, from which the area of the partial model was removed. Then the partial model is imported (File Import Submesh ...). If an attribute is already defined on a boundary node, the value of the partial model overwrites the existing value from the overall model. Since the partial model is usually up-to-date, this allocation is desirable.

If node and element numbers shall remain unchanged in one of the models, this model is opened first and then the other model part is imported, because the node numbering of the imported model is changed.

If the partial model is opened first and the overall model is imported, the 3D boundary must be recalculated (Mesh 3D 3D-Boundary Mesh boundary = 3D-boundary).

After saving the integrated model, a new model exists without internal boundaries.

 

Implementation of consistency and plausibility checks