'Swollen' boundary layer

Nazrin
Nazrin Altair Community Member
edited May 22 in Community Q&A

Hello everyone,

I am trying to do mesh study for flow over cylinder. The y+ range for BL was set at 41, Log Law region (30<y+<300).

So, I want to study the effect of cylinder's edge size towards the accuracy of drag and lift force. When I reduce the cylinder's edge mesh size (edge refinement), the BL look swollen (LOL) as shown in figure below.

image

Attached is my .hmcfd file for your reference.

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Best Answer

  • acupro
    acupro
    Altair Employee
    edited May 21 Answer ✓

    Added a small box refinement to get the size smaller at that point.

    Not sure why the edge/surface mesh is bigger at that location.

Answers

  • acupro
    acupro
    Altair Employee
    edited May 21 Answer ✓

    Added a small box refinement to get the size smaller at that point.

    Not sure why the edge/surface mesh is bigger at that location.

  • Nazrin
    Nazrin Altair Community Member
    edited May 21
    acupro_21778 said:

    Added a small box refinement to get the size smaller at that point.

    Not sure why the edge/surface mesh is bigger at that location.

    Tq for the fast solution. Out of topic, can the dev team add this as bug to be fixed in the next release?

  • acupro
    acupro
    Altair Employee
    edited May 22
    Nazrin_21804 said:

    Tq for the fast solution. Out of topic, can the dev team add this as bug to be fixed in the next release?

    Don't know when it will be fixed - but I have submitted the bug ticket.

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