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Home Forums CFD foundation course: Forum Staggered grid

  • Posted by Jayagowri Tharanitharan on October 21, 2022 at 10:03 am

    Sir,

    I got couple of questions.

    1. Can you elaborate how staggered grid overcomes the false pressure gradient computation?
    2. if the solver runs separately for two meshes and couple them or just run for one mesh but stores velocity value at the face of the cell? if it just stores, how the pressure for main C.V. center and velocity for staggered grid center are determined separately when coupled eqns are solved?
    3. is this method used in popular CFD solvers normally by default?
    4. Is it also employed in unstructured mesh?

    Sandeep replied 1 year, 7 months ago 2 Members · 1 Reply
  • 1 Reply
  • Sandeep

    Administrator
    November 24, 2022 at 11:46 pm

    Hi,

    -Staggered grids are used to overcome the false pressure gradient between the neighboring cells. I think we have discussed it in the video. In such cases even if we have a pressure gradient we may not be capturing it because the pressure gradient term is of the first order.

    -It is the same mesh, not two meshes. But it is the way we store the data. it will be clear when you write the program for SIMPLE algorithm in the course.

    – It is used in CFD solvers popularly. But there are alternate methods too especially on unstructured meshes which are not covered in this introductory course. But more details you can get from the Test book by Verstig and Malalasekara.

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