CFX! Introduction Domains represent 3d regions where governing equations are solved Domains can be comprised of more than one solid joined together Domains can also contain internal 3D regions Cutouts- solid obstacles to flow Sub-domains Fluid sub-domains volumetric sources/sinks of mass heat and momentum s Solid sub-domains: conjugate heat transfer Cutouts and sub-domains are defined using existing solids Domain/sub-domains are used to define the physical models and physical properties for the CFX-5 simulations CFX5.5 V5.5.1H 2001AEA Technology
CFX 5.5 V5.5.1H © 2001AEA Technology 5-2 Introduction Domains represent 3D regions where governing equations are solved - Domains can be comprised of more than one solid joined together - Domains can also contain internal 3D regions > Cutouts - solid obstacles to flow > Sub-domains * Fluid sub-domains: volumetric sources/sinks of mass, heat and momentum * Solid sub-domains: conjugate heat transfer > Cutouts and sub-domains are defined using existing solids Domain/sub-domains are used to define the physical models and physical properties for the CFX-5 simulations
CFX! Rules for solids in domains Each solid in the domain/Sub-domain specification must be a valid cFx- Build solid Solids may not overlap one another If there is more than one bounding solid defining the Domain/Sub- domain, each solid must be connected at a common solid face(point or edge contact is not allowed) Cutout solids must lie wholly within the regions defined by the bounding solids ofthe domain/sub-domain The connection of a cutout solid with a bounding solid must be at a common solid face Multiplecutout solids can be used If cutout solids are connected to each other they must do so at common solid faces Sub-domains must lie wholly within the regions defined by the domain The connection ofa Sub-domain with a domain must be at a common solid face CFX5.5 V5.5.1H 2001AEA Technology
CFX 5.5 V5.5.1H © 2001AEA Technology 5-3 Rules for Solids in Domains Each solid in the Domain/Sub-domain specification must be a valid CFXBuild solid. Solids may not overlap one another. If there is more than one bounding solid defining the Domain/Subdomain, each solid must be connected at a common solid face (point or edge contact is not allowed). Cutout solids must lie wholly within the regions defined by the bounding solids of the Domain/Sub-domain. The connection of a cutout solid with a bounding solid must be at a common solid face. Multiple cutout solids can be used. If cutout solids are connected to each other they must do so at common solid faces. Sub-domains must lie wholly within the regions defined by the Domain. The connection of a Sub-domain with a Domain must be at a common solid face
CFX! Rules for solids in domains Sub-domains may not be created within other Sub-domains Only one level of nesting is permitted i.e. you cannot create Domains and sub-domains within cutout solids These rules apply to both fluid and Solid Sub-domains, and no special consideration is needed for Solid Sub-domains CFX5.5 V5.5.1H 2001AEA Technology
CFX 5.5 V5.5.1H © 2001AEA Technology 5-4 Rules for Solids in Domains Sub-domains may not be created within other Sub-domains Only one level of nesting is permitted i.e. you cannot create Domains and Sub-domains within cutout solids These rules apply to both Fluid and Solid Sub-domains, and no special consideration is needed for Solid Sub-domains
CFX! Examples for CFX-5 Topology Case l In the following case, you need to specify all three solids in the bounding solids list for the domain specification, as solid 2 is an integral part of the domain, in addition to defining the sub-domain Solid 1 Solid 2 Solid 3 (Sub-domain Domain bounding solid= Solid 1+ Solid 2 Solid 3 Sub-domain bounding solid= Solid 2 CFX5.5 V5.5.1H 2001AEA Technology
CFX 5.5 V5.5.1H © 2001AEA Technology 5-5 Examples for CFX-5 Topology
CFX! Examples for CFX-5 Topology Case 2 In the following case, you need to specify solid 1 as the bounding solid for the do sold 2 as the bounding solid for the sub-domain. Specifying solid 2 as part of the bounding solid of the domain is an eror Solid 1 Solid 2 (Sub-domain Domain bounding solid= Solid 1 Sub-domain bounding solid solid 2 CFX5.5 V5.5.1H 2001AEA Technology
CFX 5.5 V5.5.1H © 2001AEA Technology 5-6 Examples for CFX-5 Topology
CFX! Examples for CFX-5 Topology ase 3 In this case, you need to specify solid 1 as the bounding solid for the domain and solid 2 as the bounding solid for the sub-domain Specifying solid 2 as part of the bounding solid of the domain is an error N B If Sold 2 does NoT share faces with Solid 1 (e. g. they are independent solids)th would also be an error Sold 1 Solid 2 (Sub-domain) Domain bounding solid=Solid 1 Shared face Sub-domain bounding solid Solid 2 CFX5.5 V5.5.1H 2001AEA Technology
CFX 5.5 V5.5.1H © 2001AEA Technology 5-7 Examples for CFX-5 Topology Case 3
CFX! Examples for CFX-5 Topology ase 4 If Case 3 is defined in a different manner, where the Sub-domain Solids form part of the domain, the following case arises. These will produce the same results Solid 1 Solid 2 Domain bounding solid=Solid 1 2 Shared face Sub-domain bounding solid solid 2 CFX5.5 V5.5.1H 2001AEA Technology
CFX 5.5 V5.5.1H © 2001AEA Technology 5-8 Case 4 Examples for CFX-5 Topology
CFX! Domains Acton Modity Fluid Domain Existing Fluid Doman Domain name Domain Options Domain options Fluids Editor Fluid editor Number of phases. Number of Fluids:1 Fluid models Fluid Models ase opting Multiphase options List Editor Bounding solid(s Bounding Solids Cutout solids Cutout solid(s) CFX5.5 V5.5.1H 2001AEA Technology
CFX 5.5 V5.5.1H © 2001AEA Technology 5-9 Domains Domain name Fluid models Bounding solid(s) Fluid editor Cutout solid(s) Domain options Number of phases Multiphase options
CFX! Domain Options 〓 Domain Options 回区 Simulation type Reference Frame Steady state Refer Coord. Frame Transient Coord o Time steps Time duration Reference Pressure Pressure Domain motion Stationary Simulation Type Rotating Steady State Axis of rotation Domain Motion Angular velocity sti-」 Reference frame Reference pressure Close Expression Editor 10 CFX5.5 V5.5.1H 2001AEA Technology
CFX 5.5 V5.5.1H © 2001AEA Technology 5-10 Domain Options Simulation type - Steady state - Transient > Time steps > Time duration Domain Motion - Stationary - Rotating > Axis of rotation > Angular velocity Reference frame Reference pressure