AuraFlow is one of the only true open source models with both the code and the weights being under a FOSS license.
Download aura_flow_0.2.safetensors and put it in your ComfyUI/checkpoints directory.
You can then load up the following image in ComfyUI to get the workflow:
The following is an older example for: aura_flow_0.1.safetensors. The workflow is the same as the one above but with a different prompt.