CFM v1.0 is available to our customers. At present it is internally used by Transport Phenomena Technologies, LLC to assist our customers’ thermal management engineers. The code is able to represent a circuit pack containing longitudinal-fin heat sinks on its high-power components (cooled by single-phase air or water)  and provide the optimal geometry of the fins assuming a laminar flow. It accomplishes this by hybridizing computational fluid dynamics (CFD), flow network modeling (FNM) and multi-variable optimization (MVO). The circuit pack is represented as an FNM, where, importantly, the flow and thermal resistances of the heat sinks are determined by look-up tables for pre-computed CFD results. These tables contain the dimensionless flow resistance (Poiseuille number) as a function of fin spacing, thickness and length and Reynolds number and the dimensionless conjugate Nusselt number as a function of these parameters and, additionally, Prandtl number of the coolant, and heat sink material-to-coolant thermal conductivity ratio. Thus, much of the accuracy of a full CFD representation of the circuit pack is preserved, but it may be solved at the speed of FNM. An MVO is wrapped around the flow network and the user may specify an objective function, e.g., maximize the inlet temperature of the coolant, and an arbitrary number of constrains, e.g., on fin spacing and thickness due to a chosen manufacturing method. CFM has been validated against full CFD simulations and is accurate to within a few percent. Please see the Publications tab for a detailed description of how CFM works or get in Contact with us.