[CIG-LONG] Gale Velocity Boundary Condition

[Feng Lin]

Hey everyone,

I get a problem about the Velocity Boundary condition when I setup my model.

The model is a 2D box x=2 y=0.5
and make both the left and right side static

"staticLeft": "true",
"staticRight": "true"

I need this kind of velocity B.C.:
for the right side of box,
I want top 0.3 is set as vx=1
but don't fix the bottom 0.2 in x direction so that they can flow out side from the left side.

If I set 

"velocityBCs" :{
        "type": "CompositeVC",
        "vcList": [
            {
			"type": "WallVC",
                	"wall": "right",
                	"variables": [
                    		{
                        	"name": "vx",
                        	"value": "step(y-0.2)*1"
                   		 }, ...

then the bottom 0.2 is set to vx=0 ( because of the step function)


can I set the top 0.3 of the right side vx=1, and  set the bottom 0.2 of the right side free ( like doesn't set vx for boundary condition)?

Best Regards,
Feng Lin

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