UNABLE CREATE A MOVINI REFERENCE FRAME

Sivaprakash_V
Sivaprakash_V Altair Community Member
edited June 28 in Community Q&A

Hi Good Afternoon,

I am trying to create a Moving Reference Frame in Hypermesh Cfd, But I can't do it.
I selected the surface or solid, then I select the axis ( surface center). One dialogue box which I want to enter the Angular velocity value, then scroll down it. Here in the X and Y,  I need to put zero. If I put 0 in the X and Y, The axis would moved. 
Here I attached the Screenshot, I faced a issue with it.
image
image

How to fix this issue?

Thanks & Regards,

Sivaprakash V.

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Answers

  • Jagan Adithya Elango
    Jagan Adithya Elango Altair Community Member
    edited June 28

    You don't need to modify the coordinates. The coordinates in the 1st image are appropriate and you can proceed with it. 

  • Sivaprakash_V
    Sivaprakash_V Altair Community Member
    edited June 28

    Thankyou for your Confirmation.

    I used the above MRF and Angular velocity is 157, stagnation pressure is Zero at Inlet and Outlet. I got one velocity, I didn't Understood which units is mentioned. I am using the CAD units during the Geometry Import process. Geometry is Designed using milli meter. I share the screenshot of the velocity contour results. Could you tell me which units is mentioned here?image

  • acupro
    acupro
    Altair Employee
    edited June 28

    The first entry in the image (where it's currently 1.0) is the angular velocity.  That value should represent units of radians per second - even though the hover/pop-up may show RPM (in error).

    Those entries you get when you click the double-arrow pull-down allow you to set the rotation center manually - any point through which the axis of rotation passes.

  • acupro
    acupro
    Altair Employee
    edited June 28
    SIVAPRAKASH V said:

    Thankyou for your Confirmation.

    I used the above MRF and Angular velocity is 157, stagnation pressure is Zero at Inlet and Outlet. I got one velocity, I didn't Understood which units is mentioned. I am using the CAD units during the Geometry Import process. Geometry is Designed using milli meter. I share the screenshot of the velocity contour results. Could you tell me which units is mentioned here?image

    The solver itself (AcuSolve) doesn't have any concept of units, per-se.  All the dimensions, material properties, boundary conditions, etc need to represent a consistent set of units.  While SimLab does have the ability to specify units during the problem setup, HyperMesh CFD does not yet have that functionality.  Thus, you'll need to make sure everything is consistent within HyperMesh CFD.  Otherwise, things will be jumbled.  (If your units are mixed/inconsistent - distances in mm, density in kg/m^3 for example - the results will not make sense.)

    For example, if you measure a distance using the Measure tool, and you know the returned value represents a distance in mm - then you need to make sure all the material properties, boundary condition values, etc, are consistent with distances being in mm.  (For example, density would need to be kg/mm^3 rather than kg/m^3.)

    In most cases, if you know properties, BCs, etc in MKS units (based on meters), it's easier to scale the geometry such that distance values are consistent with meters.  You can scale the geometry, prior to meshing, in the Geometry ribbon - using the pull-down for the 'Edit' section.

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