fluid flow and where the trailing edges of the bluff body are sharply defined at approximately 90 degrees to the mean fluid flow path a low pressure zone behind the sharp edge corner is created dynamic pressure attempts to u2018 fill up u2019 the low pressure void the size and characteristics of the vorticular u201c whorls u201d or coils of rotating fluid thus generated are entirely dependent upon the configuration of the bluff body s and the pressure velocity pulsation characteristics of the u2018 dynamic u2019 primary fluid flow the internal mechanical arrangement of pump elements of the device is such that a bluff body vortex generator is placed in the u2018 nose cone u2019 airflow pattern where vortex action is enhanced promoted by pulsations from the auger rotation in fact the end of the auger tube acts as a bluff body and is in the appropriate airflow position to generate sufficient vortex action with pulsations from the auger rotation to start the zvvac this condition is only generated when the appropriate air flow rates occur and target velocities are achieved as dictated by internal nose cone configuration clearances and auger rotational pulsation speed when the pipeline interior surface is covered with vortex conditions thus generated a zvvac has been achieved note proper system operation does not occur when an identical pressure velocity static.