《CFX5.5培训资料》（英文版）Domains

CFX! Domains CFX5.5 V5.5.1H 2001AEA Technology

CFX 5.5 V5.5.1H © 2001AEA Technology 5-1 Domains

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 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 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