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How should I solve a heat transfer equation in elliptic region by Fourier Transform method?

Case: Subsea Pipeline Detail Fatigue Analysis by Force Model (Direct Wave) Ref.: DNV-RP-F105 (Feb 2006), sec. 5.3.2 Question: To calculate the in line stress range (due to drag and inertia loads) I do not know what boundary conditions to be considered? (e.g. pin-pin or fix-fix, or etc)

Refer to API 618 capacity of reciprocating compressors could be controlled by unloading device, clearance pocket and spillback control valve. If five steps unloading (i.e. 0, 25, 50, 75 and 100% of full flow) are used in combination of spillback control valve, it is kindly requested to inform us...

Refer to API 618 capacity of reciprocating compressors could be controlled by unloading device, clearance pocket and spillback control valve. If five steps unloading (i.e. 0, 25, 50, 75 and 100% of full flow) are used in combination of spillback control valve, it is kindly requested to inform us...

Case: Pipelaying by Barge Near an Existing Platform (the barge is anchor handling type) Question: what is allowable lateral distance between pipelaying barge and existing platform? Many thanks in advance.

Ref.: DNV-RP-F105 (Feb 2006) •Question 1 Sec.: 4.2.1 & 4.2.2: Could somebody literally explain the meaning of “integration over the long term distribution for current velocity represented by a Weibull distribution or histogram”. (If possible to provide a simple example, please) •Question 2...

Ref.: DNV-RP-F109 (Oct 2007), sec 3.4.5 (EQs 3.21 & 3.22) My case: modeling of subsea pipeline in a trench Question: I understand in case distance of pipeline from either trench sides/walls is more than 3D (D is pipe outside diameter) the load reduction due to trenching is not considered. Is...

ABAQUS/ AQUA: How can i model Lift Force on a pipeline in ABAQUS/AQUA? (NB, i know how to model drag and inertia forces)

Regarding ABAQUS / AQUA, I am doing static analysis for a subsea pipeline, Question: how can I get flow velocity / acceleration on the pipeline in the output (*.dat)?

To run a T.INP file in ABAQUS/Standard I use the following command: Abaqus job=T datacheck interactive Then Abaqus job=T continue interactive Can somebody advise how to run a INP file which has subroutine FRIC (when I use the above commands it errors)

Ref. DNV-RP-C205 (Apr 2007): Re wave induced votex shedding, I understand in Keulegan-Carpenter number (Kc) (sec. 9.7.1.3) the maximum orbital velocity (Vm) is quoted “maximum orbital velocity due to wave motion” , but I interpret Vm should be read the maximum fluid particle velocity due to...

Ref. DNV-RP-F204, App.A (fatigue assessment), Can somebody explain the meaning of “auto-spectral density for stress range” (uased in Eq.A.9 of above ref), and if possible provide an example or reference for its calculation.

Ref: DNV-RP-F204 (July 2005) App. A (narrow band fatigue damage assessment) Regarding fatigue damage calculation, in Eq A.3 the effect of wave probability is not considered, while I expect the wave probability should be accounted. (NB, in Eq. 2.8 the effect of wave probability has been...

Ref: DNV-RP-F204 (July 2005), Sec. 3.4.1 – it is quoted as follows: Quote The effect of the Design Fatigue Factor (DFF) should be taken into account by reducing the allowable stress range by a factor (DFF)^-0.33 Unquote I am confused whether to apply the above for all the cases (i.e. detail...

DnV-RP-F109 Sec. 3.4: what is the meaning of SEED?

How Bauschinger Effect can be modeled in ABAQUS/CAE? Thanks in advance

To calculate Pipeline & Riser wall thickness as per ASME 31.8 VIII, I understand the effect of under-thickness tolerance due to manufacturing and corrosion/erosion shall be considered as follows: Pipeline WT: corrosion/erosion under-thickness effect to be considered (ref. 804.222), but...

I recently am working on a s&T heat exch. in which both tubesheet faces are cladded. The tubes are strength welded to tubesheet. As per tema RB-7.6, te tubeside clad thk. shall be 1/8" min while the shellside clad thk. shall be 3/8" min. The presumption is that the weld prevents the tubeside...

To model pipeline on seabed in ABAQUS/CAE, I use contact between Pipeline and Rigid Body (seabed). To model lateral / axial friction as function of lateral / axial displacement, based on preliminary investigation I note that ABAQUS has option for friction based on Slip Rate. While I look for the...

Regarding Subsea Pipeline coated with concrete, to model pipeline for stress/strain analysis in ABAQUS and using pipe (or beam) elements (e.g. element Pipe31), I do not know how to model Stress Concentration Factor (SCF)? (SCF in the field joints) (Just for clarity, in ANSYS for element...