@property
    def wavenumber(self):
        return 2.0 * np.pi * self.frequency / self.soundspeed
Ensure default security group exists for a project_id.
dataset/ETHPy150Open python-acoustics/python-acoustics/acoustics/reflection.py/Boundary.wavenumber--crossover with--dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/db/api.py/security_group_ensure_default