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nonuniform pressure distribution

Question asked by Serhey Moroz on May 29, 2013
Latest reply on Jun 3, 2013 by Jared Conway

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Hello colleagues

I am simulating a model of storage bin, assuming it's loaded with coal. Bin walls are nonuniformaly loaded due to pressure decrease in vertical direction. I use "nonuniform distribution" in "pressure" feature. It seems to be simulating all right. My walls are quite big, I can see that stress is changing a lot between top and bottom. Now, I would like to confirm that my quadratic function that I inserted is actually doing right job. I am trying to prob "free body force" by using "List Result force" feature in repots. Unfortunately I cannot measure my load close to certain node/area. It selects whole surface, and giving me force as function of area and pressure applied to it.

Please, anyone who has bigger experience, advice me on that. Ideally it would be great to know the pressure in certain areas of surface. Or, maybe it's possible to measure the pressure acting on separate "mesh element". I cannot get it right.

Thank you for any advice

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Chatura Elkaduwa May 29, 2013 11:39 PM
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Hello Serhey,

Create splitfaces (using split lines) on the respective faces where you need to measure localised forces, prior to running the simulation.
Once the calculation is complete you may use the pre defined splitfaces as references to measure forces.
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- Serhey Moroz @ Chatura Elkaduwa on May 30, 2013 11:35 AM
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  Thank you Chatura
  I just did a bunch of experiments with that, that works. But, there is another problem now. My bin is difficult shape structure, every applied to it force/pressure tends to deform it, there is a lot of moments (rotations) in between components. So, now when I prob my separate elements, numbers do not make any sense. Even if I select only one direction, it still shows me a number which is under moment’s effect. I think this feature is not what I need, since it shows me an actual force/moment as a sum of all forces acting on mesh element. I am actually looking for a chance to measure amount of force/pressure which is acting on surface initially. That's what you load your model with only, it's independent of any reaction/deformation forces.
  For instance, if you support your component not evenly, apply pressure load on whole surface. One end of component might move toward (opposite) to direction of applied load, because of the way it's supported. However, the pressure applied to this end is still acting in initial direction and has same rate, no matter where your reactions go. That's what I want to measure in my case. I know it might be unnecessary, I can always verify the load in feature settings, but in nonuniform load distribution case that would be a good help to track-down mistakes.
  Any thoughts?
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Jared Conway May 30, 2013 5:51 PM
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"Now, I would like to confirm that my quadratic function that I inserted is actually doing right job."

If this is all that you need to do, what about setting up a sample that is simpler to calculate the total force from your nonuniform pressure distribution vs area and then read off the reaction force at the fixed face. if they match, you know your method is working and you can probably assume that as long as you applied things properly, your full model is working especially if the displacements and general shapes are as you expect.

or are you looking for something more simple?
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- Serhey Moroz @ Jared Conway on May 30, 2013 6:07 PM
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  Thank you for reply Jared
  That's exactly what I do now, calculating load (kN) on component using Excel and compare it with sum of reactions in the model. It's a little headache, because in order to verify one load I have to suppress others, otherwise they are compensating or partially compensating each other and my reaction reading is not thru. Another problem would be that I still would like to truck-down the pressure change, just to make sure it's changing in proper direction and proper way. I can kind of guess looking at load arrow sizes, but it's more for representation, I cannot measure them.
  Is there anyone esle with ideas on that? Any help is greatly appreciated!
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  - Jared Conway @ Serhey Moroz on May 31, 2013 4:25 PM
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    just to be clear. what you're looking for is basically a feature that would let you plot the values on the surface so that you can confirm it is being transferred properly?
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    - Serhey Moroz @ Jared Conway on May 31, 2013 5:08 PM
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      Yes, correct
      Just to mention again, I am looking for values that applied to surface as external loads. They are varying depending of coordinates.
      Thank you
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      - Jared Conway @ Serhey Moroz on May 31, 2013 5:10 PM
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        personally the method you're using is the way that i'd do it
        and also validating with a test case
        and plotting your function in excel or similar to see how it looks
        
        the only other thing i can think of is looking at the forces in the .out file but again, that is more work than you're ok with.
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        Serhey Moroz @ Jared Conway on May 31, 2013 6:50 PM
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        Thank you Jared
        I am keep going this way for now, cannot afford playing with it anymore. However, I will post something in case if I find better way. Please do so as well.
        Have a nice weekend!
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        Jared Conway @ Serhey Moroz on Jun 3, 2013 11:13 AM
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        i'd connect with your reseller on this one so they can double check we haven't missed anything and if necessary check with solidworks technical support/development. if there isn't anything else, it sounds like a good enhancement requests. you can submit it through customerportal.solidworks.com
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        Serhey Moroz @ Jared Conway on Jun 3, 2013 12:07 PM
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        Good idea!
        I will do so, thank you Jared
        Do I have to have some certain registration for that?
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        Jared Conway @ Serhey Moroz on Jun 3, 2013 3:28 PM
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        for calling technical support, you'll have to check with your reseller
        
        for the customer portal, just login, and plug in your company's information. it will connect it to your serial and subscription service and give you access to everything.
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