1. A method for providing patient-specific blood flow information using at least one computer system with at least one processor, the at least one computer system including a touchscreen, the method comprising: displaying, on the touchscreen, a three-dimensional model based on patient-specific data, the three-dimensional model representing at least a portion of an anatomical structure of the patient; receiving, from a user, an input relating to a location on the touchscreen, the input indicating a modification of the three-dimensional model and causing the computer system to generate a display of an intervention at a location of the three-dimensional model corresponding to the location on the touchscreen; determining and displaying information regarding the blood flow characteristic in the anatomical structure based on the modification of the three-dimensional model; and enabling the user to interact with the touchscreen to move the displayed intervention along a vessel to update the determined and displayed information regarding the blood flow characteristic based on further modification of the three-dimensional model.