box position for FlowTool


I am using the flowTool to get volume flow rate through an opening in between two chambers in a geometry where fluid passes from one chamber through that opening.

To get the accurate flowrate, should I place the box such that that opening falls somewhere in the middle of the box that encompass the opening coordinates? Or should I try to position the box such that the opening falls flush on any of the face of the box that is same size of the opening?


  • It is a bit difficult to comment on w/o any pictures, but could you perhaps do both and see the end result?

    Then you should have the insight needed to decide what is most suitable for your understanding of the physics.

    Kind regards

  • hello,

    i am simulating the cowl plenum system of an automotive. that is the passages infront of the windshield that takes rain water down. so these are hidden underneath the hood area close to the wipers. There are two openings on LHS and RHS of those conduits. Both openings have 4 flaps. I am monitoring the flow rate through the LHS flaps and I removed those flaps when I simulated with SPH.

    In the attached pictures, in the Box1 picture I have shown the box around those flaps. In simulation the flaps are removed as I said before. But I kept those in the snap shot just for demonstration. However, the flow measurement was giving zero flow rate. This can be seen in the attached xls file.

    In the 2nd attached picture, box 2 is a bigger size box as I thought may be there is no fluid that pass through the box 1 because of insufficient time being simulated which would allow some fluid to pass through that box. But still I see zero flow are. See 2nd attached xls file.

    Please let me know if any set up is incorrect. Thanks.

  • Please can you send the following files to

    • XML file (no need to send to us any STL or important geo)
    • these two .png
    • these tow .xlsx
    • bat (or sh) file you use to compute FlowTool
    • boxes.txt that FlowTool is using


  • thanks. I have sent an email.

  • Email received, we will check when possible

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