External Pressure Effects on non-flooded pipes.

If external pressure effect should be accounted for, and the hydrodynamic module is activated, the following command has to be given:

ExtPres Auto


Usfos will then use the Surface Level defined in WaveData to compute the external pressure on every element. Flooded elements will be given extrpress=0.0.

In the example, elements 3 and 5 are flooded. The actual reduction coefficient (Q/Qcr) could be visualized in xact and in found under Global/Verify.

Usfos input files to the actual example are found in the following two files:

=> Usfos Control File
=> Model File

Figure 1: Visualization of External Pressure reduction factor. Note that Elements 3 and 5 are flooded.