# Dylan Stelzer

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1. ## Is it possible to perform a Shape Optimization while maintaining constant total volume?

Rahul R, I can see that you're manually creating the shape perturbations this the attached example. I forgot to mention this in my original post but I'm wondering if there is a way to translate this to a free shape optimization? Is it possible to go through the same method you've shown here? I'm going to do some personal investigating of the matter but as a "slight" solution at the moment, I am using a volume constraint with an upper and lower bound in such a way to arrive at a final shape that is within <2.5% of the original volume. I know it is not an exact solution if volume were constant but I'm using this as an estimation. Thoughts? Dylan Stelzer
2. ## Is it possible to perform a Shape Optimization while maintaining constant total volume?

As stated by Rahul R on the same post but in a different thread: "Hi, In order to keep the same mass or volume please refer attach video. Regards Rahul R" mcon.swf
3. ## Is it possible to perform a Shape Optimization while maintaining constant total volume?

Hi, I am trying to run a model which simulates that of a cantilever beam with circular cuts designed into it at regular intervals. I have a force load applying in compression along the top edge of the beam and would like to perform a shape optimization of the circular cuts while maintaining constant volume of the model under a minimizing compliance (maximizing stiffness) objective. I've tried it a few different ways but can't get the model to converge after more than two iterations (the optimization isn't progressing very far most likely due to the strict volume constraints. So what I would like to know is if it is possible to perform a shape optimization while maintaining constant volume of the model. I understand that this may be a difficult problem for the solver as I'm asking it to make changes while perhaps not giving it room to work with. If an upper and lower bound constraint of the original volume is too tight of a constraint, how loose do I have to make the constraint to allow for a reasonable shape optimization to be performed while maintaining (mostly) a constant total volume? Thanks for your input! I've attached the .HM file as well if you would prefer to take a closer look at the problem setup and optimization parameters. Dylan Stelzer Compressive_Load_(Uniform)_Optimizaton_Setup_1.hm
4. ## Is it possible to perform a Shape Optimization while maintaining constant total volume?

Hi, I am trying to run a model which simulates that of a cantilever beam with circular cuts designed into it at regular intervals. I have a force load applying in compression along the top edge of the beam and would like to perform a shape optimization of the circular cuts while maintaining constant volume of the model under a minimizing compliance (maximizing stiffness) objective. I've tried it a few different ways but can't get the model to converge after more than two iterations (the optimization isn't progressing very far most likely due to the strict volume constraints. So what I would like to know is if it is possible to perform a shape optimization while maintaining constant volume of the model. I understand that this may be a difficult problem for the solver as I'm asking it to make changes while perhaps not giving it room to work with. If an upper and lower bound constraint of the original volume is too tight of a constraint, how loose do I have to make the constraint to allow for a reasonable shape optimization to be performed while maintaining (mostly) a constant total volume? Thanks for your input! I've attached the .HM file as well if you would prefer to take a closer look at the problem setup and optimization parameters. Dylan Stelzer Compressive_Load_(Uniform)_Optimizaton_Setup_1.hm
5. ## HyperMesh Remesh Error #7330

Tinh, Thanks for responding! You're right, that is a very clear error indeed! That works and the remeshing can now start but I am running into another error within the remesh input/output files. Apparently a problem with the subcases. Do you have any input on the attached error? Thanks for all of your help. Dylan Stelzer
6. ## HyperMesh Remesh Error #7330

Hi, I'm running a 3D model and am trying to perform a shape optimization on 5 similar structures on a beam. It is a beam with 5 circular cuts made throughout it with a specific loading applied to it. I ran the shape optimization once and it ran for 12 iterations and then gave the error that the mesh became too distorted and was unable to proceed with the optimization. I looked online and found that most people are using the "remesh" option in the opti-control setting to combat this type of termination error. I have applied the remesh option in opti-control and ran the optimization again but now I am receiving the error shown in the image below which I can't seem to find any information for on the forums. Would anybody be able to weigh in on this? Thanks ahead of time! Dylan Stelzer

8. ## Importing Data as a Force Load

I tried your method and did some research but still haven't had any luck for a few days now. I think I'll make a more detailed post and see if I can get any more specific information on where I'm running into problems. The tough part is that I've never even dealt with Tcl scripts before so I'm wondering in foreign land here. Thanks for your help though! Dylan Stelzer
9. ## Importing Data as a Force Load

I'll give it my best shot. Hopefully I can figure it out because doing it one by one is driving me mad! Thanks again. Dylan Stelzer
10. ## Importing Data as a Force Load

I'll google "how to" on the TCL script part, that doesn't sound too hard but where do I make the jump from reading Excel data to assigning them...I know there are only a few ways of assigning (specifically for me, I need it to be a force): components, vector, equation, linear interpolation, etc. etc. Thanks for replying though!
11. ## Importing Data as a Force Load

Hi, I had a question concerning the integration of an array from Excel (or for that matter, any type of data where it is a string of numbers) into a boundary condition loading in HyperMesh. I have two arrays of length 126; is there any way to apply them to each of my 126 selected nodes in my HyperMesh model (it is composed of 2-D shell elements)? I've attached a picture of a section of the arc if that helps. I am trying to divide up a normal load over an arc into horizontal and vertical forces efficiently and quickly. If anyone has any suggestions, that would be greatly appreciated. Thanks! Dylan Stelzer
12. ## Number of Iterations for Topology Optimization

Depending on your model, your optimization parameters, and your objective? Yes, 3 iterations could lead to an "optimal result". If you're not satisfied with the answer, try changing your constraints around or re-working the boundary conditions for your problem. That would be my "noob" opinion
13. ## Errors in Utilizing OSSmooth

Hi Prakash, Thanks for answering! What do you mean by "update" the elements for conduction? I'll attempt my own interpretation on this but could you explain any further? I believe you mean reapplying the conduction interface to the elements found on this geometry surface but I want to be clear. Thanks. Dylan Stelzer
14. ## Errors in Utilizing OSSmooth

Hi, Would anyone have any answers as to why the OSSmooth version of my model is creating errors for itself with respect to the conduction interface? I had an original version of HyperWorks 13.0 and never had a problem with OSSmooth and when I had to uninstall and download it again, I started getting errors whenever I tried to use OSSmooth on my models. I've attached some pictures below to help give some context to the problem as well as the error but if anyone has any suggestions or needs more background to the problem, I'm more than willing to attach the entire model file or fill you in on the specifics (properties, boundary conditions, etc. etc.). Any help would be really appreciated! Thanks. Dylan Stelzer
15. ## Force Constraints Perpendicular to Surface

Thanks for replying! I'll try doing an isolated test on doing what you suggested (switching from a nodal force to an elemental pressure) and see if that gives the type of results I'm looking for. I never thought of using pressure instead of force but yes, I presume the answers would be very similar if done correctly. Dylan Stelzer
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