{"id":307554,"date":"2023-09-20T07:37:12","date_gmt":"2023-09-20T07:37:12","guid":{"rendered":"\/forum\/forums\/topic\/issue-with-void-region-in-external-flow-simulation-2\/"},"modified":"2023-09-20T07:37:12","modified_gmt":"2023-09-20T07:37:12","slug":"issue-with-void-region-in-external-flow-simulation-2","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/issue-with-void-region-in-external-flow-simulation-2\/","title":{"rendered":"Issue with Void Region in External Flow Simulation"},"content":{"rendered":"
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Hello, ANSYS community,<\/p>\n

I’m currently working on an external flow analysis and have encountered a perplexing issue during my simulation setup. I hope someone here can shed some light on this matter.<\/p>\n

Problem Description:
I have created an enclosure around my body and successfully performed a Boolean (subtract) operation to create a fluid domain. This step went smoothly. Subsequently, I imported the model into ANSYS Fluent for meshing. After assigning the necessary local sizing and creating the surface mesh, I noticed some unusual messages in the console:<\/p>\n

1) “After surface mesh, there is 1 fluid\/solid region and 1 void.”
2) A region named “fluid” was automatically created under the “Update Region” options, and the region type assigned was “fluid” for that region.
Attempted Solutions:
In an attempt to resolve this, I proceeded as follows:<\/p>\n

1) I ignored the first error message and selected an option called “The region consists of only fluid with no void regions” during the setup.
2) I altered the region type for the automatically created “fluid” region from “fluid” to “dead.”<\/p>\n

However, my actions led to a new warning message in the console:<\/p>\n

“Region fluid cannot be deleted as it is completely enclosed by other regions.”<\/p>\n

Questions:
At this point, I find myself with two primary questions:<\/p>\n

1) Why is there a void region present when my intention was to create a fully enclosed fluid domain around my body?
2) How might the presence of this void region affect my simulation results in both cases (with and without modifications to the “fluid” region)?<\/p>\n

I would greatly appreciate any insights, suggestions, or guidance regarding this issue. Your expertise and advice will be invaluable in helping me resolve this unexpected challenge in my external flow analysis.<\/p>\n

Thank you in advance for your assistance.<\/p>\n

Best regards,
Paul<\/div>\n

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