Transparent obstacles

[Ella Chaumont]

Hello,

Is there any way to make obstacles into transparent? I set RGB=(0,0,0) and it did not work.

Thanks in advance.

[Emanuele Gissi]

See paragraph 10.2.6 of the Users' Guide.

[Ella Chaumont]

Thanks Emanuele for your response. I went through this section and I wanted to explain my requirements in more detail. Please correct me if I am wrong. Here is my apparatus. 

• I need to have a fire with certain intensity.
• To do that I need to have a VENT to insert the SURF ID of the fire.
• To have a VENT I need to create an obstacle as in the picture and on top of that I create a VENT. But this obstacle is solid and nothing passes through it.
•  But I need to pass (under gravity) the cylinder above the fire through the fire. I can't do it because of the solid OBSTACLE. Again if I make a HOLE there I can't create a fire in the mouth of the HOLE. Can I?

Thanks in advance.

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[Kevin McGrattan]

I can tell you how to make the fire without an obstacle, but how are you going to move the cylinder?

[Ella Chaumont]

Hi Kevin,

I am trying to use the method in dragon_5a example case by including PART ID and INIT PART ID to initiate the cylindrical particle.

On Fri, May 7, 2021 at 10:27 AM Kevin McGrattan <mcgr...@gmail.com> wrote:

I can tell you how to make the fire without an obstacle, but how are you going to move the cylinder?

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[Kevin McGrattan]

OK, then you can create a "burner" by creating a volume of particles shaped like a short cylinder, and assign the particles an HRRPUA, and make them STATIC. Other particles that are not STATIC will just fall through.