###INSTRUCTION: Fix disfluencies in the sentence: In the laboratory of Dr. John C. Croker, I perform the projects entitled Using Particle Image Velocimetry to Understand Complex fluid flow.
###RESPONSE: 
In the laboratory of Dr. John C. Croker, I performed a project entitled " Using Particle Image Velocimetry to Understand Complex Fluid Flows. "
In the laboratory of Dr. John C. Croker, I performed the projects entitled Using Particle Image Velocity to Understand Complex Fluid Flow.