Learning Forum

[moranlouie]

[Rob]

If you create a shared topology you won't get the nonconformal interface. That simplifies the heat transfer as you'll have a coupled wall between the hot fluid & pipe and pipe & cold fluid assuming the pipe is a solid. If the pipe isn't a solid (modelled as a volume) you'll just see a coupled wall between the two fluids and will need to give it a thickness. Have a look in the tutorials, focus on conjugate heat transfer, and also look at some of the electronics cooling examples as the heat sink is a similar set up. n

[Abbasraza20000220]

If you create a shared topology you won't get the nonconformal interface. That simplifies the heat transfer as you'll have a coupled wall between the hot fluid & pipe and pipe & cold fluid assuming the pipe is a solid. If the pipe isn't a solid (modelled as a volume) you'll just see a coupled wall between the two fluids and will need to give it a thickness. Have a look in the tutorials, focus on conjugate heat transfer, and also look at some of the electronics cooling examples as the heat sink is a similar set up.https://forum.ansys.com/discussion/comment/97817#Comment_97817

Mr. Rob, I have created two fluids one is air and other is Licl solution. Both of them are stacked to each other having same dimensions. I want to insert a membrane (PVDF Solid) between two. For this I made a geometry in Design moudular,then in meshing option I deleted the Automatic contact zones and name manually (like Airinterface , Licl interface, inlte and outlet etc). In set up option, I used the mesh interface option, by using air_interface and licl_interface zone i make a coupled wall and named it a membrane and has given a thickness. Now in post processing option, I want to see the heat transfer on membrane, the message is, Zone surface cannot create from sliding interface zone. Creating empty surface.nI want to observe the effect on wall ( which is termed as membrane).nPlease let me know that I have been something wrong? What i have to do for observing the effect on membrane.nThanks in advance.nRegards,n

[Rob]

If you'd just labelled the surface between the two fluid zones as a wall you'd have been able to display it and give it a thickness in the solver (it'd come through as wall and wall:shadow). As the geometry is zero thickness (we cheat and can give it a thickness for heat transfer) you can report numerical values but images are more limited: it's a 2d surface. n

[Abbasraza20000220]

For having a better understanding for me, I got you are saying that I have to manually name the contacts in the mesh option as a wall? If i use naming the contact region at meshing option (after deign modular) shadow not formed but trg contact region like these terms. I have been waiting for your kind answer and thanks a lot for your reply.nRegards,nAbbasn

[Rob]

If you use share topology there should be no contact region. You can then label the surface as a wall. n

[Abbasraza20000220]

Thanks a lot for your response. In the continuation, I used Merger & contact under share topology options in Design Modular, the error I am facing is attached. Please help me out. I am really sorry if mu question disturbs you.nRegards,nAbbas nn

[Abbasraza20000220]

Hi Mr. Rob, If I use, linear pattern option, the contact region is formed in the mesh option. Similarly, If i am using slice option, then again contact region is formed in the mesh option. if delete in mesh option, then using dynamic option in the solution setup, by making a coupling option I am getting 4 walls ( nWhat I used approach in the past is that I am deleting all contact regions in the mesh option and naming them manually like ( Air inlet, Air outlet, Air symmetry, Air interface) for air zone while for Licl zone (Licl inlet, Licl outlet, Licl symmetry, Licl interface). In mesh interface option under Solution setup above dynamic mesh option, by coupling wall I am getting two wall ( one and other is shadow) But in this case on increasing thickness of wall nothing is showing. I am using ANSYS 16.2nnI am struck in this problem. I am looking for ward your kind help which is highly appreciable.nnThanks in advance.nRegards,nAbbas n

[Rob]

Contact is formed between coincident faces that aren't in the same part, and (in error) by surfaces in the same body that are closer together than the tolerance. In the post from 3rd you have two bodies in separate parts that aren't adjacent. The thickness is assigned in Fluent for coupled walls, they're the wall & wall:shadow pair. n

[Abbasraza20000220]

Hi Mr. Rob.nI am explaining the whole picture. I am getting error same after doing modifications.nnI have two fluids (one is air other is Licl solution). I used design modular for modelling having dimension 100mm Length and 100mm width for a rectangular plate and their thickness 2mm. I want a membrane to be inserted in between two fluids ( having thickness 0.1mm) while length width = 100mm.nnApproach : I made two rectangular plates ( in xy plane) one is for air, while other is for licl solution. giving distance 0.5mm between them along zaxis. While importing mesh, I named all inlets, outlets, and air interface and licl interface respectively. I used default mesh option knowing the fact there was no contact region between two and moved toward setup. where I used (mesh interface option) for joining these interfaces as a membrane wall and its shadow has also been made.nI used 0.5 mm distance between in order to avoid from automatically made contact regions. If I made zero distance between two, I was getting same error like empty zone surface cannot be created.nWhat I am facing the membrane is appearing when I am clicking on showing mesh at surfaces. But what I want to see contours of temperature in post processing option even though I have given the thickness of membrane. The message I am getting is : Empty surface zone cannot be created.nnI have to make a model in which membrane is inserted between two fluids. nplease help me out. My approach is wrong or anything is missing in my settings?.Thanks in advance.nRegards,nAbbasn

[Abbasraza20000220]

Mr. Rob,nI am waiting for your kind response. Please give your valuable suggestion on this.nThanks in Advance!nRegards,nAbbas n

[Rob]

To confirm you left a gap in the model? n

[Abbasraza20000220]

No, I did not make any gap. Both plates are stacking to each other. In the above picture, I just want to give you concept that parallel plates. I made on plate of thickness 2mm in z-axis through extrusion & made another plane by giving offset of 2mm in the z direction. By using this plane, I made another plate of same dimensions, just above it. Using share topolgy, I made contact to each other.nPlease let me know, if you want to know anything.nThanks in advance.nRegards,nAbbas Razan

[Rob]

If they're connected you should have a wall and wall:shadow pair, and heat transfer is via that coupled wall. n

[Abbasraza20000220]

This coupled wall is not showing in post processing for showing results/contours of temperature & pressure. Getting message Empty surface : Zone surface cannot be created from sliding interface. Is there any method to cope with this problem? I want to see the contours on this coupled wall.nThanks in advance for your unwavering support.nRegards,nAbbas Razan

[Rob]

Yes, by not using a non-conformal interface. n

[Abbasraza20000220]

Thanks a lot Mr. Rob. I am highly thankful for your time to sort out my queries. My issue has been resolved. nRegards,nAbbas