Visualisation of velocity vector on a plane

Sibelius1202 · March 6, 2020, 05:56

I am simulating Dean Flow through a microchannel and can not for the life of me work out how to show the transverse velocity vectors. It can be done - as shown in this paper (https://www.nature.com/articles/srep44072)

I would like to get the second picture:
https://imgur.com/a/IVLEAYm

My current method has been to create a plane and then show the velocity vector on it. This however shows the veolicty along the channel rather than across it. If I go to a scalar scene I can choose the i, j, or k components of velocity, but these are not vectors.

My next step was to create a user defined field function (UDFF) that only showed the two components of velocity that I require and then apply that to the planar scene. $$Velocity[1]

However, I could not get this to work. My final attempt was to create a third UDFF that is made up of the vector components I require and multiply this by the Velocity field function. I feel like that might work but I can't find enough information on the UDFF syntax to get it working. The User manual I have acces to is pretty sparse on this subject.

Other programs have an option called 'vectors on plane' or something similar. I would like to find this option in STAR CCM+

Any help would be greatly appreciated.

cwl · March 6, 2020, 08:07

If you want just vectors i.e. straight lines with arrows - there is a "Projection Mode" property of Vector Displayer in the Scene that can be set to "Tangent".

If you want it to look more like in the image - you'll need a Section Plane and a Constrained Streamline set on it (both Part and Source) with Initial Integration Step set to small value (try 10⁻³ m for start).

Sibelius1202 · March 7, 2020, 07:39

Thank you very much, this was exactly what I was looking for!

I will look into setting a constrained streamline on the plane next, but the tangent visualisation is working well for now. It is funny how a simple button press like this can seem imposible to find. I was getting rather worried I would have to import my data into Paraview or something!

March 6, 2020, 05:56	Visualisation of velocity vector on a plane	#1
Sibelius1202 New Member Bob Houseman Join Date: Mar 2020 Posts: 4 Rep Power: 6	I am simulating Dean Flow through a microchannel and can not for the life of me work out how to show the transverse velocity vectors. It can be done - as shown in this paper (https://www.nature.com/articles/srep44072) I would like to get the second picture: https://imgur.com/a/IVLEAYm My current method has been to create a plane and then show the velocity vector on it. This however shows the veolicty along the channel rather than across it. If I go to a scalar scene I can choose the i, j, or k components of velocity, but these are not vectors. My next step was to create a user defined field function (UDFF) that only showed the two components of velocity that I require and then apply that to the planar scene. $$Velocity[1] However, I could not get this to work. My final attempt was to create a third UDFF that is made up of the vector components I require and multiply this by the Velocity field function. I feel like that might work but I can't find enough information on the UDFF syntax to get it working. The User manual I have acces to is pretty sparse on this subject. Other programs have an option called 'vectors on plane' or something similar. I would like to find this option in STAR CCM+ Any help would be greatly appreciated.

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March 6, 2020, 08:07		#2
cwl Senior Member Chaotic Water Join Date: Jul 2012 Location: Elgrin Fau Posts: 436 Rep Power: 17	If you want just vectors i.e. straight lines with arrows - there is a "Projection Mode" property of Vector Displayer in the Scene that can be set to "Tangent". If you want it to look more like in the image - you'll need a Section Plane and a Constrained Streamline set on it (both Part and Source) with Initial Integration Step set to small value (try 10⁻³ m for start).

March 7, 2020, 07:39		#3
Sibelius1202 New Member Bob Houseman Join Date: Mar 2020 Posts: 4 Rep Power: 6	Thank you very much, this was exactly what I was looking for! I will look into setting a constrained streamline on the plane next, but the tangent visualisation is working well for now. It is funny how a simple button press like this can seem imposible to find. I was getting rather worried I would have to import my data into Paraview or something!