Learning Forum

[SIDDHARTH MOHAN]

Hello, I wish to seek some guidance on a modeling issue in Ansys AEDT . I have a section of a cylinder with few elements on it's surface. How can I replicate this section into a complete cylinder ?

Attached is the image of the section.

 

need to change the above into to something like the below :

 

 

thanks 

[Praneeth]

Hi Siddharth,

Thank you for reaching out to the Ansys learning forum.

Please create a new relative coordinate system at the center of the circular cross-section of the cylinder. Then duplicate around the axis which is along the cylinder length. Kindly check "Creating an Offset Relative CS" and "Duplicating Objects Around an Axis" sections of the HFSS help document accessible under the Help menu.
Best regards,
Praneeth.

[SIDDHARTH MOHAN]

thanks for the reply Praneeth, is there  a circular co-ordinate system in AEDT like other Ansys Mechnical tools ?

regards 

[Praneeth]

Hi Siddharth,

It is possible to define the points for creating objects using either the cylindrical or spherical coordinate systems in addition to the cartesian coordinate system in the status bar of the AEDT interface. Please go through "Defining Cylindrical Coordinates" and "Defining Spherical Coordinates" sections of the HFSS help document.

Best regards,
Praneeth.

[SIDDHARTH MOHAN]

thanks for the reply, I am having hard time complete cylinder with the existing arc as the circle formed doesn't seem to be aligning with the arc properly as shown below - is that a grid related issue or something else ?

 

[Praneeth]

Hi Siddharth,

The gap you are seeing is just because of the rendering. By default, optimistic rendering is selected for a smooth user experience. You can change this by going to View menu>Render>Enhanced display and change the settings appropriately to see the outcome. After verification, you can toggle back to normal settings.

Best regards,
Praneeth.

[SIDDHARTH MOHAN]

 

thanks for the reply and if it’s not a rendering issue then what other things can I try ? I don't see any changes even after turning on rendering enhancement. 

 

[Praneeth]

Please make sure that the center and radius of the arc match exactly with that of the cylinder cross-section.

[SIDDHARTH MOHAN]

thanks for the reply. Is there another way to complete this arc into a full cylinder ? The existing methods (drawing a circle and increasing it's thickness) that I have been trying are not working well. 

 

Edge of the arc :

[Praneeth]

One general piece of advice would be to see if the arc is correctly defined or not. If it is correctly defined, then its ends will coincide exactly after duplicating around the axis. 

Please provide details on what you mean by increasing the thickness of the circle.

[SIDDHARTH MOHAN]

thanks for the reply, if I increase the thickness of the below shown circle, it's not getting aligned with the original arc. 

Drew circle and then increased the thickness of the circle but it's misaligned with arc-

 

[Praneeth]

Please check if you are increasing the thickness on one side or both sides. For your case, it should be on one side only (+ve side).

[SIDDHARTH MOHAN]

thanks but I don't think this method increasing the thickness of the drawn circle is a soution in this case s the arc has a non rectangular ending which doesn't match the thickened circle anyway - 

 Is there another way to complete this arc into a full cylinder ? 

[Praneeth]

Are you not trying to unite these arcs? If so, that would not matter. If you don't want to unite, then please check the first arc that you created. It is modified or not created properly. Any circular arc will have ends like the one you drawn using the thicken sheet unless it is modified. Hope this helps.

[SIDDHARTH MOHAN]

thanks for the reply , will you be able to have a look at it and suggest best route ahead if I share the workspace?

[Praneeth]

The Ansys personnel cannot access any of the attachments in the forum. I would recommend you to check with your seniors or tutors in your university who can guide you on the same.

[SIDDHARTH MOHAN]

I am expanding the image of the arc so as to give  a better idea on the existing arc strucutre with elements that needs to be completed into a cylinder -

 

 

[SIDDHARTH MOHAN]

Based upon the previous snapshot it will be great if you can share your thoughts on how this kind of an arc can be completed to form a cylinder ?

[Praneeth]

Please provide more details on how the first arc is created. If possible, also provide details of the model and design type you are creating to help us serve you better.

Kindly note that you can use Boolean subtract of the second arc from the first arc to create the required edge. 

[SIDDHARTH MOHAN]

sorry but I don't have the details of how the original arc was created. The cylindrical arc with the patch elements was optimized for performance as an antenna and now this section of the arc needs to be completed into a full cylinder replicating the path elements on the arc to form a cylindrical antenna array. I had shared the below image in original message in this chain to given an idea on how the cylindrical array with the elements replicated may look like.

 

[Praneeth]

In that case, it may be required to connect (unite) these arc elements. Or, you delete the intersecting portions. Please use which ever option helps you.

[SIDDHARTH MOHAN]

 

the image sent in the previous message was just to give an idea on the design type I am trying to create as it was asked. I just mirrorred the original arc to create that snapshot for understanding. The arcs don’t align at the bottom to form a proper cylinder otherwise I would have united them long back…

It’s not an arc with cental angle of 120deg such that I can hook three of these together to form a proper cylinder.

 

 

 

[Praneeth]

Since you are forming an array or patch elements, the separation between the end elements of the two consecutive arcs should be equal to that of the consecutive elements in a single arc (unless your design specifications differ). So, the extra blank spaces at the ends of an arc should be trimmed.

[SIDDHARTH MOHAN]

 

thanks for the reply, is there a way to smoothen/heal the below unification of two arcs created using the “unite” command to have a more smooth circular shape?

 

 

 

[Praneeth]

It is possible to round the edges using the "fillet" option in the draw menu. For detailed information on this, please refer to "Rounding the Edge of Objects (Fillet Command)" in the HFFS help document.

[SIDDHARTH MOHAN]

thanks edges can be rounded but what about the up and down hills , can that be circularized ?

 

 

 

[Praneeth]

It is not possible to remove the said places using healing option. As I suggested you earlier, you can remove these unwanted portions by subtracting them with some maksing objects. Please create dummy objects that will overlap with only thes unwanted portions and do boolean subtraction.