Variability in the total percentage of products in one tank

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question

Gabriela Gomes asked Oct 3, '23 Mischa Spelt commented Dec 7, '23

Variability in the total percentage of products in one tank

Is there a way to include variability in the total percentage of product in one tank?

For example: the amount of product A can only reach up to 15% of the maximum amount of the tank, so product B can reach 85% or more. If there is product A available, each tank should receive it up to the maximum volume of 15% of its capacity. If there’s no product A available, it’s ok for the tank to have less than 15% of product A in its recipe.

I’m having trouble defining this, since the model understands that the percentages are exactly 15% and 85%, without the variability. I also tried doing this with the mixer, but since it works with a recipe, you need to put the exact value, which it’s not interesting in this case.

To explain a bit more, I’m trying to add these two products together inside a tank to become a third, with the trigger “Change Flow Product”.

Software Version:

FlexSim 23.1.0

FloWorks flowtanks amount

imagem-2023-10-03-180700176.png (41.0 KiB)

1696367258514.png (6.1 KiB)

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Jeanette F ♦♦ commented · Oct 07, 2023 at 04:58 AM

Hello @Mischa Spelt,

Would you be able to take a look at this FloWorks question?

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Jason Lightfoot ♦ commented · Oct 13, 2023 at 08:49 PM

Hi @Gabriela Gomes, was Mischa Spelt's answer helpful? If so, please click the "Accept" button at the bottom of their answer. Or if you still have questions, add a comment and we'll continue the conversation.

If we haven't heard back from you within 3 business days we'll auto-accept an answer, but you can always comment back to reopen your question.

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Answer 1 · 2023-10-09T09:30:33Z

Mischa Spelt answered Oct 9, '23 Mischa Spelt commented Dec 7, '23

Hi Gabriela,

From your question it is not clear to me whether you want to look at the volume of product A vs B in the tank, or the flow rate into the tank. I will provide a solution for both.

Max. 15% of the tank volume should be product A

You can set an outflow trigger on 15% of the tank content on the supply for product A. I explained a little bit about outflow triggers in your other question. If you reach the outflow amount, you just close the supply for A.

This is demonstrated in Max15PctVolumeDemo.fsm

Max. 15% of the rate should be product A

In this case you can use the blender, as you are showing in the screenshot. This will force a ratio of 15 : 85 between products A and B, as long as there is supply for A. If the supply for A stops or decreases, the blender will decrease the supply of B accordingly. If you now create a 'bypass' from B directly into the tank, FloWorks will supply any remaining capacity from the source at B. Note: you have to set a max. inflow rate on the tank, to ensure that there will be no 'bypass' flow as long as the blender is at maximum capacity.

I have demonstrated this approach in Max15PctRateDemo.fsm

Note: in both models there is a Process Flow source which you can enable to simulate the supply of A shutting down after a while, so you can see the different mechanisms in action.

I hope this answers your question. If you have any follow-up questions, please attach your model so that we can help you with a more specific response.

max15pctvolumedemo.fsm (46.6 KiB)

max15pctratedemo.fsm (45.7 KiB)

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Gabriela Gomes commented · Oct 18, 2023 at 01:11 PM

I'm working with the volume variability, the other question was about the same model! Thank you!!

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Gabriela Gomes commented · Nov 30, 2023 at 02:57 PM

Hi, Mischa!

I'm still working on the same project. I was wondering if this solution is also viable for more than one tank. I tried splitting into 5 different blocks (one for each tank), but suddently one of the sources stopped working, and i don't know how to fix it. Can I send you the model by e-mail? I'm not sure if it's ok to post it in a open forum, since it's part of an academic project. Here's a screenshot of what i was trying to do.

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1701356141622.png (58.6 KiB)

Jeanette F ♦♦ Gabriela Gomes commented · Dec 06, 2023 at 06:03 PM

Hello @Mischa Spelt,

Could you answer this follow up question?

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Mischa Spelt Gabriela Gomes commented · Dec 07, 2023 at 08:03 AM

Hi @Gabriela Gomes , feel free to share the model by email to [email protected] and we will be happy to have a look.

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