QRadar flows represent network activity by normalizing IP addresses, ports, byte and packet counts, and other data, into flow records, which effectively are records of network sessions between two hosts. The component in QRadar that collects and creates flow information is known as QFlow.For installations on your own hardware or on virtual machines, add the QRadar Console ISO image in the root directory.
Please see the the link belov for more informations :
Installing QRadar Console - IBM Knowledge Center
If you deploy a managed host and a Console in different virtual networks, you must allow firewall rules for the communication between the Console and the managed host. For more information, see QRadar port usage.In a QRadar deployment with multiple appliances, other ports might also be allowed between managed hosts. For more information about what ports might need to be allowed in your deployment, see Common ports and servers used by QRadar.