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Simulating the collision behaviour of cloud drops in a turbulent environmentis numerically expensive. Because of the typical sizes of cloud drops, theirmotion is predominantly influenced by the smallest turbulent scales in theflow. We can exploit this property by using an Arnold--Beltrami--Childress(ABC) flow instead of a full direct numerical simulation (DNS) to simulate theturbulent effect on cloud drop collisions. This allows simulation of dropmotion using much less computational resources than needed by DNS andtherefore, allows for simulations with many more drops and larger model domainsor more complex cloud physics. This is useful in cases where a specific processneeds to be studied and the complexity and details of a realistic turbulentflow are of secondary interest.  It is shown that the simulations using ABC flow can faithfully reproducecollision statistics from much more comprehensive DNS calculations when using asimilar Taylor microscale and root mean square velocity in the ABC and DNSflows. The results from the ABC flow are robust to changes in these twoparameters within a reasonable range, even though adjustments to the parameterscan be used to further tune the results.

Simulation of cloud drop collisions in ABC flow