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flow and motion simulation together

Question asked by Richard Pradeep Chandradoss on Jan 26, 2016
Latest reply on Feb 2, 2016 by Richard Pradeep Chandradoss

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Hi Everyone,

I am new to solidworks. I need some help to do the following simulation.

I am trying to simulate a spray nozzle over a flat surface (100mm x 100mm). The nozzle of 5 mm diameter is streaming gas (60 deg C) at 100 SPL (Standard liters per min) over the flat surface. it is moving over the flat surface at 50mm/sec.

I want to measure the average temperate of the flat surface after 10 min.

I have done the fluid flow simulation of the nozzle with the flat surface at time one position. How can I import this result to motion study to get the temperature contour of the complete plate?

Glenn Whyte Feb 2, 2016 2:42 PM

Correct Answer

Hi Richard,

Like Amit says, any moving boundary isn't possible in Flow. The best approximation of this type of situation I've seen is to simulate a moving source as a series of sources in a straight line that you turn on and off with different time signals.

For example, if your nozzle is moving in the x direction, you might set up a series of pressure/flow sources that look like this:

You'd set up a pressure or flow source on each one, and by using the dependency functionality in each source, turn each one and then off on in turn at an appropriate rate to approximate the moving source. It's not perfect, but it's the best you'll be able to address in Flow Simulation, in my experience. The sources can be adjacent, but they can't overlap.

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Amit Katz Jan 26, 2016 9:21 AM

You can do a thermal simulation inside of Flow Sim, you don't need any other add-in. Try running a time-dependant simulation for 10 minutes. This might take a long time depending on the time step you choose, and the number of cells in your model. I'm assuming you're going to have a lot of cells, since you're simulating a jet.

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Richard Pradeep Chandradoss @ Amit Katz on Jan 27, 2016 5:04 AM

Thank you for the quick reply Amit. But I am not familiar with the transient flow condition. I tried to find some details about this, but I couldn't find any clear info. Do you have some links for further detailed info? it would be very helpful.

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Amit Katz Jan 27, 2016 8:26 AM

When you start a new project with the project wizard, when you get to the "analysis type" step make sure that you tick the checkbox for "Time-dependent" flow.

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Richard Pradeep Chandradoss @ Amit Katz on Feb 1, 2016 8:25 AM

Hi Amit,

I tried with transient condition. But I am not getting reasonable results. I need some help in setting the time step value for my condition.

For example if consider my nozzle is moving over the surface (100x100mm) at 10 mm/sec. what will be the time step?.

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Amit Katz @ Richard Pradeep Chandradoss on Feb 1, 2016 8:34 AM

Richard, I think I misunderstood your original intention. Flow Simulation does not allow for moving boundaries, your geometry must be fixed. The only except to this is that you can set certain axisymmetric bodies to rotate, but this has limited use.

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Richard Pradeep Chandradoss @ Amit Katz on Feb 1, 2016 8:50 AM

Also I think I can only add rotational motion about a fixed axis. As far as i checked it not possible to add linear motion.

One more quick question, Is it possible to have the flow at certain interval, not continuous flow.

For example how to simulate a flow which flows for 10 sec and stops for 10 sec and goes like this for a total 200 sec.?

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Amit Katz @ Richard Pradeep Chandradoss on Feb 1, 2016 8:53 AM

There is a way to sort of cheat something like this, you can use a time-dependent volume flow rate boundary condition. You cannot set "0" flow but you can set a very small amount. But this may not be a realistic simulation unless you are 100% sure of your actual flow rate.

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Glenn Whyte Feb 2, 2016 2:42 PM

Hi Richard,

For example, if your nozzle is moving in the x direction, you might set up a series of pressure/flow sources that look like this:

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Richard Pradeep Chandradoss @ Glenn Whyte on Feb 2, 2016 2:52 PM

Hi Glenn,

Thanks for the reply.

This is exactly what i did today. Had series of sourse at equal interval. I made a spread sheet based on the linear velocity and time step. Then I on and off the source in sequence to simulate linear motion. It's working as i want.

But I am having some other problem now. The temperature curve of the plate what i get from the simulation is different from practical observation.

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9 Replies

Amit Katz Jan 26, 2016 9:21 AM
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Correct Answer
You can do a thermal simulation inside of Flow Sim, you don't need any other add-in. Try running a time-dependant simulation for 10 minutes. This might take a long time depending on the time step you choose, and the number of cells in your model. I'm assuming you're going to have a lot of cells, since you're simulating a jet.
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- Richard Pradeep Chandradoss @ Amit Katz on Jan 27, 2016 5:04 AM
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  Correct Answer
  Thank you for the quick reply Amit. But I am not familiar with the transient flow condition. I tried to find some details about this, but I couldn't find any clear info. Do you have some links for further detailed info? it would be very helpful.
  Like • Show 0 Likes0
  Actions
Amit Katz Jan 27, 2016 8:26 AM
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Correct Answer
When you start a new project with the project wizard, when you get to the "analysis type" step make sure that you tick the checkbox for "Time-dependent" flow.
Like • Show 1 Like1
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- Richard Pradeep Chandradoss @ Amit Katz on Feb 1, 2016 8:25 AM
  Mark Correct
  Correct Answer
  Hi Amit,
  I tried with transient condition. But I am not getting reasonable results. I need some help in setting the time step value for my condition.
  For example if consider my nozzle is moving over the surface (100x100mm) at 10 mm/sec. what will be the time step?.
  Like • Show 0 Likes0
  Actions
  - Amit Katz @ Richard Pradeep Chandradoss on Feb 1, 2016 8:34 AM
    Mark Correct
    Correct Answer
    Richard, I think I misunderstood your original intention. Flow Simulation does not allow for moving boundaries, your geometry must be fixed. The only except to this is that you can set certain axisymmetric bodies to rotate, but this has limited use.
    Like • Show 1 Like1
    Actions
    - Richard Pradeep Chandradoss @ Amit Katz on Feb 1, 2016 8:50 AM
      Mark Correct
      Correct Answer
      Also I think I can only add rotational motion about a fixed axis. As far as i checked it not possible to add linear motion.
      One more quick question, Is it possible to have the flow at certain interval, not continuous flow.
      For example how to simulate a flow which flows for 10 sec and stops for 10 sec and goes like this for a total 200 sec.?
      Like • Show 0 Likes0
      Actions
      - Amit Katz @ Richard Pradeep Chandradoss on Feb 1, 2016 8:53 AM
        Mark Correct
        Correct Answer
        There is a way to sort of cheat something like this, you can use a time-dependent volume flow rate boundary condition. You cannot set "0" flow but you can set a very small amount. But this may not be a realistic simulation unless you are 100% sure of your actual flow rate.
        Like • Show 0 Likes0
        Actions
Glenn Whyte Feb 2, 2016 2:42 PM
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Correct Answer
Hi Richard,

Like Amit says, any moving boundary isn't possible in Flow. The best approximation of this type of situation I've seen is to simulate a moving source as a series of sources in a straight line that you turn on and off with different time signals.

For example, if your nozzle is moving in the x direction, you might set up a series of pressure/flow sources that look like this:

You'd set up a pressure or flow source on each one, and by using the dependency functionality in each source, turn each one and then off on in turn at an appropriate rate to approximate the moving source. It's not perfect, but it's the best you'll be able to address in Flow Simulation, in my experience. The sources can be adjacent, but they can't overlap.
Like • Show 1 Like1
Actions
- Richard Pradeep Chandradoss @ Glenn Whyte on Feb 2, 2016 2:52 PM
  Mark Correct
  Correct Answer
  Hi Glenn,
  Thanks for the reply.
  This is exactly what i did today. Had series of sourse at equal interval. I made a spread sheet based on the linear velocity and time step. Then I on and off the source in sequence to simulate linear motion. It's working as i want.
  But I am having some other problem now. The temperature curve of the plate what i get from the simulation is different from practical observation.
  Like • Show 0 Likes0
  Actions

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