A transportable fluidic apparatus configured for generating a variable periodic flow of pressurized fluid from a stream of pressurized fluid provided by a portable pressurized fluid source, comprising: (a) a nozzle assembly defining an internal lumen having an inlet segment configured to receive an inlet fluid flow, wherein said inlet segment has a converging profile which terminates distally in a power nozzle aperture having a power nozzle aperture cross sectional area, wherein said inlet segment is configured to generate a high velocity fluid stream with minimal pressure drop; (b) a first control port and a second control port in fluid communication with said nozzle assembly's internal lumen distally and downstream of and on said opposing sides of said power nozzle aperture; (c) an inertance loop interconnecting and providing fluid communication between said first control port and said second control port; (d) a setback region (48, 140) distally and downstream of said first and second control ports (CP1, CP2), said setback region defining a setback aperture having a setback aperture cross sectional area which is greater than said power nozzle aperture cross sectional area, and an outlet segment having walls terminating distally in an exhaust aperture, wherein the length and cross sectional area of the inertance loop and the relative aperture cross sectional areas of said setback aperture and said power nozzle aperture determine a frequency of said periodic flow, characterised in that the setback aperture width is 1.6 to 2.2 times the power nozzle aperture width and outlet walls ( 142, 144, 148) of the outlet segment converge at a wall angle of 0° to -15°, such that a pulsating mode of operation is provided. (a) a nozzle assembly defining an internal lumen having an inlet segment configured to receive an inlet fluid flow, wherein said inlet segment has a converging profile which terminates distally in a power nozzle aperture having a power nozzle aperture cross sectional area, wherein said inlet segment is configured to generate a high velocity fluid stream with minimal pressure drop; (b) a first control port and a second control port in fluid communication with said nozzle assembly's internal lumen distally and downstream of and on said opposing sides of said power nozzle aperture; (c) an inertance loop interconnecting and providing fluid communication between said first control port and said second control port; (d) a setback region (48, 140) distally and downstream of said first and second control ports (CP1, CP2), said setback region defining a setback aperture having a setback aperture cross sectional area which is greater than said power nozzle aperture cross sectional area, and an outlet segment having walls terminating distally in an exhaust aperture, wherein the length and cross sectional area of the inertance loop and the relative aperture cross sectional areas of said setback aperture and said power nozzle aperture determine a frequency of said periodic flow, characterised in that the setback aperture width is 1.6 to 2.2 times the power nozzle aperture width and outlet walls ( 142, 144, 148) of the outlet segment converge at a wall angle of 0° to -15°, such that a pulsating mode of operation is provided.