sarkas.tools.observables.calc_vk#

sarkas.tools.observables.calc_vk(pos_data, vel_data, k_list)[source]#

Calculate the instantaneous longitudinal and transverse velocity fluctuations.

Parameters

  • pos_data (numpy.ndarray) – Particles’ position. Shape = ( no_dumps, 3, tot_no_ptcls)

  • vel_data (numpy.ndarray) – Particles’ velocities. Shape = ( no_dumps, 3, tot_no_ptcls)

  • k_list (list) – List of \(k\) indices in each direction with corresponding magnitude and index of ka_counts. Shape=(no_ka_values, 5)

Returns

  • vkt (numpy.ndarray) – Array containing longitudinal velocity fluctuations.

  • vkt_i (numpy.ndarray) – Array containing transverse velocity fluctuations in the \(x\) direction.

  • vkt_j (numpy.ndarray) – Array containing transverse velocity fluctuations in the \(y\) direction.

  • vkt_k (numpy.ndarray) – Array containing transverse velocity fluctuations in the \(z\) direction.