• Fluid mechanics of multiphase flows; including air-water, water-sediment and plastic-water flows.
• Experimental modelling and instrumentation developments for multiphase flows.
• Numerical modelling of turbulent multiphase flows.
• Hydraulic design of water infrastructure.
• Currently interested in: air-water flows, turbulent transport of plastic particles in rivers and hydraulic structures in the context of climate variability.

• Leadership Team member of the IAHR Technical Committee on Hydraulic Structures.
• ICOLD Technical Committee C: “Hydraulics for dams”.
• European IAHR YPN representative and IAHR council member.

Valero, D., Belay, B. S., Moreno-Rodenas, A., Kramer, M., & Franca, M. J. (2022). The key role of surface tension in the transport and quantification of plastic pollution in rivers. Water Research, 226, 119078. https://doi.org/10.1016/j.watres.2022.119078

Hohermuth, B., Kramer, M., Felder, S., and Valero, D. (2021). Velocity bias in intrusive gas-liquid flow measurements. Nature communications, 12(1), 1-9. https://doi.org/10.1038/s41467-021-24231-4

Kramer, M., and Valero, D. (2020). Turbulence and self-similarity in highly aerated shear flows: the stable hydraulic jump. International Journal of Multiphase Flow, 129, 103316. https://doi.org/10.1016/j.ijmultiphaseflow.2020.103316

Kramer, M., Valero, D., Chanson, H., and Bung, D. B. (2019). Towards reliable turbulence estimations with phase-detection probes: an adaptive window cross-correlation technique. Experiments in Fluids, 60(1), 1-6. https://doi.org/10.1007/s00348-018-2650-9

Valero, D., and Bung, D.B. (2018). Reformulating self-aeration in hydraulic structures: Turbulent growth of free surface perturbations leading to air entrainment. International Journal of Multiphase Flow, 100, 127-142. https://doi.org/10.1016/j.ijmultiphaseflow.2017.12.011