kumar 
ictsresin
Research Interests:
- Fluid Dynamics and Turbulence,
- Active Matter,
- Pattern formation,
- Biophysics
Simulations:
Physics, for me, lives in the visuals. These simulations span the range of problems I have explored during my PhD — active filaments, nematic fields, deformable surfaces, and turbulent flows. Some are tied to publications; others document ongoing and exploratory work.
Filaments in Turbulent Flows
▶ Filaments in active turbulence
▶ Active filaments in Navier-Stokes
▶ Flowers in Taylor-Green vortices
Active Turbulence
▶ Heterogenous active turbulence
▶ Vortex Condensation in Active Turbulence
Cytokinesis and Deformable Surfaces
▶ Active shape dynamics and cytokinesis
▶ Dynamical remeshing in deformable surface
Nematodynamics on curved surfaces
▶ Topological defects in nematic fields on sphere
▶ Dynamical modes in active nematics on sphere
Active patterns
Vicsek Model
Publications:
4. Geometry, elasticity, and activity in the transport of self-propelled filaments in turbulence
Kunal Kumar, A. Sahoo , R. K. Singh , S.S. Ray
ArXiv:2605.24901 (Preprint, 2026)
3. Active geometrodynamics predicts the emergence of cytokinesis
A.S. Rajput, Kunal Kumar, M. Nishikawa, K.V. Kumar
bioRxiv:2025.11.07.683232 (Preprint, 2025)
2. Turbulence-Induced Fluctuating Interfaces in Heterogeneously-Active Suspensions
S. Mukherjee*, Kunal Kumar*, S.S. Ray
PNAS Nexus 5, pgag125 (2026)
1. Onset of intermittency and multiscaling in active turbulence
K.V. Kiran, Kunal Kumar, A. Gupta, R. Pandit, S.S. Ray
Physical Review Letters 134, 088302 (2025)
When not staring at turbulent flows on a screen, I am usually generating some turbulence of my own — on a bicycle, a running trail, on some mountain, a badminton or squash court, or throwing punches in kung fu.