A computer-implemented method comprising: identifying a three-dimensional CAD model representing an injection mold cavity, including a location for at least one gate; identifying a partitioning of the CAD model, the partitioning including a plurality of interconnected, three-dimensional cells that partition an interior volume of the CAD model, the interior volume corresponding to the injection mold cavity; determining (215; 505) a potential fill pattern for a material injected into the injection mold cavity based at least in part on geometry and dimensions of the modeled mold cavity and the location of the at least one gate, wherein the potential fill pattern is determined based at least in part on the dimensions and orientations of the plurality of three-dimensional cells, wherein the potential fill pattern includes a filling sequence identifying a series of flow bands corresponding to a series of time intervals, wherein each flow band includes those cells in the plurality cells filled with the material after the corresponding time interval; generating (220; 515) a strip model of the CAD model based at least in part on the determined fill pattern, wherein generating a strip model includes: identifying a number of strip segments for use in approximating a flow domain corresponding to the interior volume; and assigning interconnected cells in the plurality of cells to each strip segment according to the filling sequence, interconnected cells included in flow band corresponding to earlier time intervals assigned to a particular strip segment prior to other cells included in flow front bands corresponding to later time intervals, wherein strip segments are assigned interconnected cells until populated; and using the strip model to perform a strip analysis simulating injection of the material within the injection mold cavity. identifying a three-dimensional CAD model representing an injection mold cavity, including a location for at least one gate; identifying a partitioning of the CAD model, the partitioning including a plurality of interconnected, three-dimensional cells that partition an interior volume of the CAD model, the interior volume corresponding to the injection mold cavity; determining (215; 505) a potential fill pattern for a material injected into the injection mold cavity based at least in part on geometry and dimensions of the modeled mold cavity and the location of the at least one gate, wherein the potential fill pattern is determined based at least in part on the dimensions and orientations of the plurality of three-dimensional cells, wherein the potential fill pattern includes a filling sequence identifying a series of flow bands corresponding to a series of time intervals, wherein each flow band includes those cells in the plurality cells filled with the material after the corresponding time interval; generating (220; 515) a strip model of the CAD model based at least in part on the determined fill pattern, wherein generating a strip model includes: identifying a number of strip segments for use in approximating a flow domain corresponding to the interior volume; and assigning interconnected cells in the plurality of cells to each strip segment according to the filling sequence, interconnected cells included in flow band corresponding to earlier time intervals assigned to a particular strip segment prior to other cells included in flow front bands corresponding to later time intervals, wherein strip segments are assigned interconnected cells until populated; and using the strip model to perform a strip analysis simulating injection of the material within the injection mold cavity. identifying a number of strip segments for use in approximating a flow domain corresponding to the interior volume; and assigning interconnected cells in the plurality of cells to each strip segment according to the filling sequence, interconnected cells included in flow band corresponding to earlier time intervals assigned to a particular strip segment prior to other cells included in flow front bands corresponding to later time intervals, wherein strip segments are assigned interconnected cells until populated; and using the strip model to perform a strip analysis simulating injection of the material within the injection mold cavity.