How to divide the region for 3D geometry in ANSYS CFD Post
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Hi,
I have a complex and irregular shape of the geometry (Please find the attached file) May I know, how to divide the geometry into different region and calculate for the volume for each region. Thank you Naima |
Hi,
Any chance you divided the domains before the simulation? In CFX Post you can put "=volume()@S1" in a table to calculate the volume of a domain, where 'S1' is your domain name. If it is just one domain, then I don't know how to do this in Post.. If you have the CAD-files where they are specified as different parts, you could specify them as different domains in CFX-pre and then run the simulation. Then you can gather information for a specific domain. |
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Thank you KWG for the useful information.
I have tried out the example of equation that you had given. Let say I want to calculate the volume of velocity lambda-2 in a domain name as volume 2. But the error message pop up (Please find the attached file). May I know, how to solve for this. Thank you again Naimah |
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Hi,
Your second picture (which says syntax error) is because you shouldn't use the ''='' when you write an expression. Your first picture, from what I understand, is that CFX is expecting zero arguments in the formula for volume. You put "velocity lambda-2" in the expression, but you should just leave it blank. You can either write the formula in a table (picture 1) or as an expression (picture 2) to calculate the volume of a domain. Note that in the expression you don't use the "=". Let me know if this is exactly what you want and if this solves your problem. |
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Hi KWG,
It is very helpful. Thank you so much. I have 1 more question,let say I have region of interest (ROI)(as in the circle in the attached file). I can calculate the volume of that region based on the method that you showed. If I want to calculate the volume of variable eg velocity lambda-2 at certain threshold at that ROI, how i am going to do that? Is that Possible? Thank you Naima |
I don't think that is possible. From what I found in the CFX reference guide is that you cannot define any argument in the volume formula. I am also not familiar with this variable velocity lambda-2, what does it represent?
From the CFX Reference Guide: 14.5.29. volume Calculates the volume of a 3D location. volume()@<Location> where: • <Location> is any 3D region (such as a domain or subdomain). An error is raised if the location specified is not a 3D object. For details, see volume (p. 177). |
Thank you KWG,
As far that I understand lambda-2 is the indication which part is consider as a vortex. Actually my main interest is to know whether the volume of this lambda-2 at certain part can be calculated or not. |
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