OASES version 1.8 allows for computing the field in stratified flow. This option is only valid in the 2-D versions, handling flow parallel to the direction of propagation only (downstream or upstream). Flow is only allowed in isovelocity fluid layers!
The flow is activated by specifying the usual parameter line for the layer:
| D | cc | cs | [L] |
with as a flag, i.e. by setting the shear attenuation for the layer to -888.888. The flow speed in m/s is in a separate line immidiately following the layer data line.
The sign convention is positive for flow from source to receiver (downstream propagation) and negative for flow from receiver towards source (upstream propagation).
As an example, the following is the OAST file saffip1.dat corresponding to the SAFARI test case 1 with a flow in the water column of 5 m/s towards the source (upstream propagation):
SAFARI FIP case 1. Flow -5 m/s. J N I T 5 5 1 0 4 0 0 0 0 0 0 0 0 1500 0 0 -888.888 1.0 0 -5.0 # flow speed 5 m/s towards source 100 1600 400 0.2 0.5 1.8 0 120 1800 600 0.1 0.2 2.0 0 95 100 100 1 1 200 1E8 -1 1 1000 0 5.0 20 1.0 20 80 12 10