Arrow missing in the velocity vectors in fluent

Silence · March 1, 2020, 13:01

Hello everyone,
I encountered a problem when I was checking the velocity vectors, some parts of the fluid model have lost velocity arrows, shown in following figures, can anyone tell me why this happens?

vinerm · March 1, 2020, 14:05

The arrows are there, however, the mesh is improper. You appear to have not set a proper ideal height for the layer. Due to that, at least what is visible from the view in the image, there is only one cell thickness across whole of the region. And Fluent is showing one set of arrows corresponding to one layer.

Silence · March 1, 2020, 23:05

Quote:

Originally Posted by vinerm

The arrows are there, however, the mesh is improper. You appear to have not set a proper ideal height for the layer. Due to that, at least what is visible from the view in the image, there is only one cell thickness across whole of the region. And Fluent is showing one set of arrows corresponding to one layer.

thanks for your reply, can I consider the result of this simulation is not reliable because of the improper height setting?

vinerm · March 2, 2020, 03:11

The objective of using CFD is to be able to predict variation in the fields over the space. With this mesh, no variation could be predicted, hence, the results are inaccurate and most likely invalid.

March 1, 2020, 14:05	Arrows	#2
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 35	The arrows are there, however, the mesh is improper. You appear to have not set a proper ideal height for the layer. Due to that, at least what is visible from the view in the image, there is only one cell thickness across whole of the region. And Fluent is showing one set of arrows corresponding to one layer. __________________ Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.

March 2, 2020, 03:11	Reliability	#4
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 35	The objective of using CFD is to be able to predict variation in the fields over the space. With this mesh, no variation could be predicted, hence, the results are inaccurate and most likely invalid. Silence likes this. __________________ Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.

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