[alok2000]

There is a small pipe inside a box, one surface of box is inlet and opposite surface of box is outlet, also, that pipe inside box has also one inlet on one side and other on opposite side, I am providing the conditions of two velocity inlets and outlets are pressure outlets. so when simulationsa are over, the velocity field is not merging with each other and remains discontinuous, I tried applying boolean substraction but then the flow was over the pipe. Dont know how to proceed.

[CFDKareem]

Can you explain a little bit more about what your intended results are? From the description, it sounds like a flow over a pipe. Are you trying to have the pipe empty into the box?

[alok2000]

yes the pipe is empty

[CFDKareem]

Originally Posted by alok2000

yes the pipe is empty

If I understand correctly and you have a box with a pipe entering and emptying into the domain, then there is two ways to do this.

The first, and best way, would be to make the entire domain one solid, or 1 cell zone. Create a void where the pipe is, assign inlet to the top, assign inlet to the pipe, and outlet on the bottom (or side). The two flow streams will enter the domain and combine. See picture "xxx_1zone".

The second, which is how I believe you are doing it now, is using 2 cell zones. If this is the case you should make the interface wall "interior" in Fluent. In the attached picture, this interface is labeled in orange. Apply the inlet to the pipe, inlet to the box, and outlet to the box. The "interior" condition will couple these two cell zones and allow the flow from the pipe to empty into the box. See picture "xxx_2Zone".

Let me know if I understand this correctly.

[alok2000]

Please see the image attached,

there were results for it, but I wanted continuous field, as then I have to use DPM for particle tracking as well

Thanks for your reply

[CFDKareem]

Originally Posted by alok2000

Please see the image attached,

there were results for it, but I wanted continuous field, as then I have to use DPM for particle tracking as well

Thanks for your reply

Ahhh okay, thanks for the clarification! You can do this using the "Fan" option for an interior surface and specifying a pressure jump across the interface.

In meshing, label your pipe inlets (ex. PipeIn) and label your pipe exit (PipeOut). In Fluent, assign the PipeOut as "interior" and assign the "PipeIn" as "Fan". You can now give a pressure jump at this interface to achieve the required flow and recirculation. For more information on setting the fan profile check out the fluent theory guide. See attached pictures for details.

Let me know if this is what you are looking for!

[alok2000]

Hi thank you for the reply, actuall in design modeler first I have drawn a sketch and then surface from sketch so one body is made, than one body I made inside it using same, how to merge these two bodies so that they behave like one. I tried creating new part and share topology but couldn't do so.

[AlexanderZ]

in your case both zones are into one part, you don't need to share topology