Geometry
 

Hi, I m doing a project on CFD, and i need to make a cylinder with inlet and outlet. how can i make this type of geometry? i can easily create a cylinder but how to manage the inlet and outlet pipes on the same cylinder? i m using this approach: 1- main cylinder sketch then i made circles at the top n bottom of cylinder and then i extrude it with cut material option. is this approach correct or not?

You have not mentioned the CFD package you're using but most CFD packages work with the flow volume geometry.. so your model should be a subtraction of flow region from complete original 3D model.. If you could post some pictures it might evoke precise suggestions...

I m using ANSYS-Fluent for my project. i need to make a cylinder having inlet and outlet pipes at both sides of the cylinder one at the top and the other at bottom.

Well... there are almost countless ways of how you could easily achieve this model in any basic 3D modelling software.. if help in modelling this geometry is all you're here for, better place to start would be Youtube full of 3D modelling as well as basic CFD tutorials.. i think you would really need to get past that to be able to start with anything significant...
Nonetheless, a quick summary would be to create the larger solid cylinder..choose the desired co-axial planes and create smaller solid cylinders for top and bottom respectively and extrude & merge in previous result.. better way would be to form an assembly of all these individual components to have a better quality & control over mesh..

How can i merge the results together? and which operation should i opt while extruding the inlet n outlet pipes?

I have no idea which software package are you employing to model the the geometry so it would be pretty hard answering your question... as i said, for basic modelling, video tutorials may end up giving you a lot more then you can expect... CFD forum usually encourages CFD queries i believe...

As i said i m using ANSYS-FLUENT for my project. i have done tutorials for basic flow profiles now i need to simulate a cylinder with inlet and outlet. and i want to confirm that when i merge the inlet pipe with the cylinder then does this block the two bodies i-e there will be flow or not?

That's not a 3D software you are designing the geometry in I guess.. nevertheless, go to ANSYS Design Modeler and see if all three cylinders are distinct parts and appropriately connected.. if these are distinct 3 parts then you may either need to perform boolean operations (union) else create interfaces in Fluent.. if it shows as one part then good going and proceed to mesh.. again it would be hard to say anything further without some images of the progress you make/ have made..

My mistake, I m making geometry on ANSYS-Design modeler and solving my case on fluent. thanks for your guidance.

Alright, in that case just use boolean functions to union the parts or bodies you create.. that would be the most convenient option.. if you have any other 3D modelling software at disposal, this would be a lot more convenient and you may save some effort and export the STEP file to ANSYS DM instead... cheers.

CAN we just use 'form new part' to make them a single unit?

If you're modeling all the cylinders sketching under one part then you would not need anything at all.. you would only need any merge/ union etc operation if you have a multiple body/ part geometry..