Position Field Function

amish · January 5, 2012, 12:56

Hi Guys,

I'm relatively new in using Star CCM, and I have a pretty complex task to do. I've used tutorials and gained a pretty decent understanding of how to get most basic thing working (I hope).

My main task is to create a free surface flowing pond, with inlet and outlet, so I can track the residence time distribution of injected particles. Instead of starting out with a irregular pond shape. I've decided to use a simple rectangular "pond" with a simple inlet and outlet.

Now I believe my set-up is correct, and I'm using a implicit unsteady, multi-phase flow, with gravity, and modelling air and water. Now I would like the "pond" to initially be filled halfway with water, so the inflow can generate a steady current.

In the initial conditions, I set the volume fraction as a composite, and used a field function to define the water as I had seen in a previous tutorial. I am using the field function:

Code:

($$Position[1]<=-0.5)?1:0

But when I make a scalar plot of this field function it does not appear to show anything, and I'm not sure why.

Any help would be greatly appreciated.

Many Thanks

Amish

willimanili · January 6, 2012, 03:29

Initialize the solution and then you should see your initial condition setting at the boundaries.

amish · January 6, 2012, 10:54

Hey thank you so much for that. I did indeed forget to initialise, however I also forgot to select the fluid as a part to show.

Once doing both. It showed up nicely, and I'm glad the field function worked out well.

Thank you.

January 5, 2012, 12:56	Position Field Function	#1
amish New Member Join Date: Jan 2012 Posts: 5 Rep Power: 14	Hi Guys, I'm relatively new in using Star CCM, and I have a pretty complex task to do. I've used tutorials and gained a pretty decent understanding of how to get most basic thing working (I hope). My main task is to create a free surface flowing pond, with inlet and outlet, so I can track the residence time distribution of injected particles. Instead of starting out with a irregular pond shape. I've decided to use a simple rectangular "pond" with a simple inlet and outlet. Now I believe my set-up is correct, and I'm using a implicit unsteady, multi-phase flow, with gravity, and modelling air and water. Now I would like the "pond" to initially be filled halfway with water, so the inflow can generate a steady current. In the initial conditions, I set the volume fraction as a composite, and used a field function to define the water as I had seen in a previous tutorial. I am using the field function: Code: ($$Position[1]<=-0.5)?1:0 But when I make a scalar plot of this field function it does not appear to show anything, and I'm not sure why. Any help would be greatly appreciated. Many Thanks Amish

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January 6, 2012, 03:29		#2
willimanili Member Join Date: Feb 2011 Location: DE-PB Posts: 56 Rep Power: 15	Initialize the solution and then you should see your initial condition setting at the boundaries.

January 6, 2012, 10:54		#3
amish New Member Join Date: Jan 2012 Posts: 5 Rep Power: 14	Hey thank you so much for that. I did indeed forget to initialise, however I also forgot to select the fluid as a part to show. Once doing both. It showed up nicely, and I'm glad the field function worked out well. Thank you.