my problem
 

Hellow every one, I modeled a spillway but error happen during running, as shown in attached images
http://www.cfd-online.com/Forums/att...1&d=1454682464
Attachment 44977
Attachment 44978
Attachment 44979
Attachment 44980
Attachment 44981
https://drive.google.com/open?id=0B3...m1FYUdZbnBySXc

FAQ: http://www.cfd-online.com/Wiki/Ansys..._went_wrong.3F

Why are you using a moving mesh on a spillway simulation? This sounds unusual.

dear Glenn Horrocks thanks for your reply
I dont much know about moving mesh, only I used mesh adaption in CFX in order to capture free surface because I cannot refine entire model (lack of HP computer), but in the second run I removed mesh adaption, error does not occur but the solution does not convergence is it due to mesh quality or time scale, boundary condition... (because during run between each iteration said "a wall hass been at portion of out let boundary condition (at 73 of faces)"

There is an FAQ on the "A wall has been placed" warning as well: http://www.cfd-online.com/Wiki/Ansys...f_an_OUTLET.22

In my experience free surface models require very high mesh quality. Mesh adaption will not give you high enough mesh quality, especially if it is going a bit bezerk (as the negative volume error implies). So do not use mesh adaption.

The error you are getting on the no mesh refinement simulation is a sign of another different problem.

Dear Glenn Horrocks thanks a lot
I re run my model by using opening BC. at outlet, but for global initialized for inlet I entered velocity in X and Y direction, my inlet opposite to the direction of x and y axis is it required to enter as negative ? or not, also I specify inlet geometry height as the depth of water.

I do not understand your question. Can you please explain it more carefully, and post an image of what you mean.

CFX running
 

thanks for your reply,
my question is that first as shown in fig. one direction of inlet opposite to the X-Y axis, so in global initialization put value of velocity (u, v) in negative or positive? as shown in figure one
another question is " during running my model only ( u.v.w, RSM and P RSM) are appear unlike picture three (means does not contain mass of water and air) as well as I used RANS eq. (mass and momentoum)" thanks
https://drive.google.com/open?id=0B3...zRudXFhYnA2Vkk
https://drive.google.com/open?id=0B3...G5ULTNURlZ1NUk
https://drive.google.com/open?id=0B3...G5pcjZBcVVPNGs

I do not have permission to see those files. Please attach them in the forum rather than posting links.

http://www.cfd-online.com/Forums/att...1&d=1455265573
http://www.cfd-online.com/Forums/att...1&d=1455265621
http://www.cfd-online.com/Forums/att...1&d=1455265660
pictures one and two about inlet boundary condition, and third picture is not my simulation but my problem is during running iteration my simulation does not contain (mass of air and water ) means continuity equation only contain momentum eq.
best regards

Your global initial condition of a u velocity does not look a good idea. It is not a good approximation of the real flow. I would just use a zero velocity for everything.

Also make sure you define your inlet pressure taking into account the reference conditions. Have a look at the tutorial problem flow over a bump to see how they do it.

thanks a lot my problem is about to solve, but I have another problem, I created my geometry by many parts (because of complex geometry to facilitate mesh refinement) this interface prevent running model how can I removed the effect of these interface (I cannot delete it by right click on them)
best regards
http://www.cfd-online.com/Forums/att...1&d=1455345400
http://www.cfd-online.com/Forums/att...1&d=1455345418

You will need to remesh to remove the interfaces.

remesh? in mesh (ANSYS ICEM), can you explain more clear

dear Glenn, I deactivated the interface but the problem is repeated, I read all previous threads about this case, I can solved this problem by create one solid geometry but I donot want like this because I want to refine each part separately.
thanks for your reply
best regard

So it sounds like your problem is a meshing problem, not a CFX problem. Try the ANSYS geometry and meshing forum.

thanks for your reply
but my problem related to CFX because I only (un check) automatic create interface only

In that case I do not understand what you are asking. Post post some images and a clear explanation of what you are asking.

ok, my question is clear, my model is spillway, when I run my model as one solid part no problem, but my model consist three parts as shown in fig. (easier meshing) problem of (3 isolated region) appear, (as in CFX there is option to define pressure level, no slip wall.... but I dont want to define it because my geometry has one inlet and outlet so I dont know pressure at that location) how to remove this isolated region.
best regards
http://www.cfd-online.com/Forums/att...1&d=1455551246

You need to mesh it as a multibody part or use interfaces to connect the mesh regions together.